Caldera was an Imperial charter just north of Balmora. It was built to service the nearby ebony mine, providing the miners with homes, entertainment and religion. The town was ruled largely from the Caldera Mining Company's fortress to the northeast. The buildings, which had Imperial and Nordic architectural influences, formed an inverse "L" shape between two large guard towers. While Dunmer presence in Caldera was almost non-existent, a large contingent of Orcs (as well as their pet scamp) lived in the dilapidated Ghorak Manor. Notable institutions in Caldera included an Imperial Cult altar, a Mages Guild branch, a pawn shop, a tavern and one of the only Imperial-style clothiers in Vvardenfell.
Camlorn is a major city of High Rock, located on its northwestern coast. The city was previously the center of a kingdom, also called Camlorn, which was founded in 2E 302. It was originally part of Skyrim, but was absorbed into High Rock over time. Camlorn was once home to a gladiatorial team known as the Dragons. The city is known as the "Jewel of the West".
In 2E 541, the city was sacked by a horde of Reachmen, led by Durcorach the Black Drake. After the Reachmen were defeated, Camlorn, along with Daggerfall, Shornhelm, Evermore and Wayrest, signed the first Daggerfall Covenant.
In 3E 63, the Prince Pelagius, who would go on to become Pelagius Septim II, visited the city of Camlorn to woo the daughter of King Vulstaed, Quintilla, regarded as the most beauteous princess in Tamriel. She would later go on to become his second wife.
Cann was a ruin in the Shivering Isles. Though the initial origin of Cann is all but unknown, the last notable inhabitants were a group of Manic idealists who brought residents of the Isles (and sometimes beyond, in the case of Beldring of Palgania) to the ruins to be housed and pampered for days on end. Ultimately, the group who oversaw this project fled the ruin, and the bloodbath that they caused.
 Lake Canulus
Lake Canulus is a small lake in the far east of Cyrodiil, between the Silverfish and Panther Rivers. It is surrounded by old forts, mines, camps, and caverns. A great monastic complex of the Alessian Order was once built along its shores, but it was razed during the War of Righteousness, and much of its archives were destroyed.
 Cape of the Blue Divide
The Cape of the Blue Divide is the waters of the Aldmeri Dominion around Summerset Isle. Stros M'Kai is noted for its strategic position near the waters. "By the Blue Divide" is a common saying among Altmer.
 Castle Volkihar
Castle Volkihar is an ancient castle perhaps dating back to the Merethic Era or the early First Era. It is located on an isolated island off the coast of Haafingar Hold in Skyrim, near the border with High Rock.
 Ceporah Tower
The Ceporah Tower is an ancient structure on the Isle of Artaeum, an island in the Summerset Archipelago. It is so old, it even predates the arrival of the Altmer on the island by several hundred years.
The tower is used by the Psijics in some of their rituals, but is most famous as the location beneath which Vanus Galerion confronted Mannimarco about the latter's increasing fascination with necromancy and soul-trapping. It was this confrontation that led directly to the founding of the Mages Guild.
 The Chain
Cheydinhal is a city in eastern Cyrodiil whose architecture and culture contains heavy Dunmer influence due to its close proximity to Morrowind's border. Located in the foothills between the Valus and Jerall Mountains, Cheydinhal sits on the northeastern edge of the Nibenay Basin, a river valley of tributaries to Lake Rumare and the Niben River.
Cheydinhal consists of three districts: Cheydinhal Castle, Market, and Chapel. The river is crossed by three bridges: a single bridge to the north connects the Market district to the Chapel district, while two smaller bridges to the south connect the southwest plaza and Chapel via a small island park. During the Oblivion Crisis, Andel Indarys of House Hlaalu was the count.
Chorrol is a medium-sized town in northwestern Cyrodiil, between the Great Forest of west Cyrodiil and the Colovian Highlands of the Hammerfell border. The city is divided into five main districts: Fountain Gate, Castle Chorrol, Chapel Street, West District and the Great Oak Place. Situated in the rugged highlands of Colovia, the city's grounds are strewn with large boulders that set the mountainous mood of the city as much as they serve as obstacles to pedestrians. The walls are well-fortified in anticipation against attack, with watchtowers placed at regular intervals along its length. The ruler of Chorrol at the time of the Oblivion Crisis was Countess Arriana Valga, widow of the hereditary Count of Chorrol.
 Clavicus Vile's Realm
Clavicus Vile's Realm is a realm of Oblivion, created and ruled over by Clavicus Vile, the Daedric Prince of Wishes. It appears as a tranquil countryside, dotted with majestic cities of glass and ornate buildings. The city of Umbriel was once a part of the realm, but was eventually severed and came to rest in an unnamed realm of Oblivion.
Cyrus the Redguard once visited the realm in 2E 864 to bargain with Vile, who had been given the soul of his sister, Iszara, by the Sload necromancer N'Gasta. Cyrus won the Prince's game and rescued his sister's soul.
In 3E 433, one of Vile's artifacts, the Umbra Sword, was returned to the realm by the Champion of Cyrodiil at the Prince's request. However, Barbas, the Hound of Vile, knew it was a poor decision and attempted to stop its return, as the sword contained a piece of the Prince's power which had gained sentience. The being, who called himself Umbra, escaped the sword once it was brought to the realm, and stole a significant amount of the Prince's power before fleeing to the edge of the realm. To prevent Umbra leaving with his power, Vile sealed the borders of the realm, essentially sealing them all within.
In the early years of the Fourth Era, a hole was opened into the realm by the first ingenium, a device created by two Dunmer males named Sul and Vuhon. The hole leached power from the realm, which was used to prevent Baar Dau crashing into Vivec City after the disappearance of Vivec. In return, the mortals provided a steady steam of souls, so Vile permitted the hole to remain. Umbra was drawn to it, and, when the ingenium was destroyed by Sul, briefly breaking Vile's barrier, he threw the Umbra Sword to Tamriel to prevent the Prince trapping him within. Sul and Vuhon were also pulled into Vile's realm, where they were beset by Umbra. Vuhon struck a deal with him, and the two fused to become a being called Umbriel. A second ingenium was constructed, and Umbriel used it to rip a piece of Vile's realm away, which was set loose in the Void. This detached bubble of Vile's realm contained an inverted pyramid of rock, similar in appearance to a floating mountain, topped with a beautiful city and containing vast labyrinths of passages below. It also came to be called Umbriel. The pocket realm was inhabited by the Um-Hist, sentient trees related to the Hist of Tamriel, and the ingenium transformed worm-like larvae into strange humanoids of many kinds, known as Umbriellians. It was eventually severed from Vile's realm in 4E 40 by the power of the White Gold Tower.
While Umbriel invaded Tamriel, Vile's realm was left in ruin. Without access to his power, Vile's realm shrank, dissolving at the edges until it was only a few miles in radius. The Prince summoned Sul and Prince Attrebus Mede to his realm when they made contact with the unstable Umbra Sword on Solstheim, where he aided them in attempting to take down Umbra. It is unknown if his realm recovered after his stolen power was returned.
 Clockwork City
The Clockwork City, also known as Sotha Sil, is a giant underground complex created by the god of the same name, Sotha Sil. It is not truly a city, consisting only of brass tunnels and domes with Dwemer-inspired architecture and gears. The exact location of the Clockwork City is unknown; it is thought to be located somewhere in the southern swamps of Morrowind, but there is also evidence to suggest that it is located somewhere beneath the settlement of Old Ebonheart. From his city, Sotha Sil had hoped to "forge the future" and "reshape the world". After the loss of Kagrenac's Tools at Red Mountain in 3E 417 he retired to the city and slowly became almost completely detached from the real world.
The Clockwork City is filled with hostile Verminous and Hulking Fabricants, mechanical creatures engineered by Sotha Sil and created by machines. The Clockwork City has several known sections: the Outer and Inner Flooded Halls; the Halls of Delirium, Theuda, Sallaemu and Mileitho; the Central Gearworks; the Chamber of Sohleh; and the Domes of Kasia, Serlyn, Udok, the Imperfect and Sotha Sil. The god dwelled in the Dome of Sotha Sil; he was guarded by two Imperfects, giant robotic constructs. The city could only be accessed through the use of Barilzar's Mazed Band, a magical ring of teleportation.
In 3E 427, the goddess Almalexia, having been driven mad by her loss of immortality, manipulated the Nerevarine to retrieve the Mazed Band, which she used to murder Sotha Sil in cold blood and transport his fabricants into Mournhold to wreak havoc. She then tricked the Nerevarine into going to the Clockwork City to kill the late Sotha Sil, who she blamed for the attacks. Once there, she attempted to murder the Nerevarine as well, but wasn't powerful enough and was struck down. The Clockwork City was then left, abandoned.
 Cloud Ruler Temple
Cloud Ruler Temple was built by Reman Cyrodiil's Akaviri Dragonguard at the founding of the Second Empire. Until the end of the Third Era, it served as the headquarters of the emperor's bodyguard: the Dragonguard and the Blades. It is one of the most dramatic remaining examples of Akaviri architecture, located high in the Jerall Mountains near Bruma.
Cloudrest is a city in the northern regions of Summerset Isle, located atop Eton Nir, the highest mountain on the isle. It features an unusual mixture of architectural styles, with vine-like buildings built on top of other, older structures. The oldest of all the ruins are made of coral, which must have been carried many, many miles away from the sea. The material and the style of the ruins strongly suggest that the Sload may have had a hand in their construction.
The city was once home to a gladiatorial team called, rather redundantly, the Gladiators.
Coldharbour is a realm of Oblivion created and ruled over by Molag Bal, the Daedric Prince of Domination. It contains an apocalyptic version of Nirn; the sky is on fire, the ground is a barely-traversable sludge, and the realm is filled with ancient, blackened ruins. A defiled copy of the White Gold Tower exists, splattered with blood and excrement.
The realm is desolate and barren, filled with suffering. It is unnaturally cold, even with magical resistance. The air assaults the senses, changing rapidly from rancid death to sweet flowered perfume.
Sotha Sil journeyed to Coldharbour in 1E 2920 to bargain with Molag Bal. The mage Morian Zenas famously visited the realm during his voyages through Oblivion, and wept at the sight of the desolation. A female Vampire Lord of pure blood, who has been gifted vampirism directly by Molag Bal, is known as a Daughter of Coldharbour. In a speech to the Champion of Cyrodiil, Mankar Camoran incorrectly names Meridia's realm Coldharbour.
 College of Winterhold
The College of Winterhold is a school for Magic in the city of Winterhold. The campus is large and fortress-like in appearance. The buildings are separated by a central courtyard and various walkways. It functions much like the Mages Guild in other parts of Tamriel, except in its being a singular and completely independent establishment. The College itself is located across a large stone bridge, parts of which have crumbled to the sea below. The College has documents dating back as far as the late Second Era, though the College itself is even older. Ever since the Great Collapse, it has been sitting precariously on a surviving, inverted pyramid of rock that juts out of the sea.
In the late Third Era, the College became home to the Ysmir Collective, a library rescued from destruction in the east. It became the cornerstone of academic life at the College, and scholars from all over Tamriel descended on Winterhold to study its contents.
The College has struggled to maintain its prominence in Skyrim in the Fourth Era for a number of different reasons. The local Nords, who remained skeptical of magic despite the prestige the College brought to their city, became even more distrustful after it came out conspicuously unscathed during the Great Collapse. The College maintains that it was spared thanks to ancient magical protections not afforded to the surrounding city. However, the many troubles of the Fourth Era resulted in a significant loss of their history.
Colovia is the western part of Cyrodiil and is known for its austere, martial culture and rugged population of Nordic descendants. The region is comprised of Anvil, Chorrol, Kvatch and Skingrad counties, and the Imperial Reserve. Most of the population resides in the cities of the south, although there are scattered farms and settlements throughout the area. The region around the sea port of Anvil is known as the Gold Coast. The region around Skingrad is known as the West Weald, and is well known for its vineyards and tomato farms. The city of Kvatch lies on a rocky outcrop between Anvil and Skingrad, with the Colovian Highlands stretching away to the north. The city of Chorrol is the main population center in the northern part of Colovia, a hilly, forested region sandwiched between the Great Forest and the Colovian Highlands.
 Colovian Highlands
The Colovian Highlands are a hilly, forested region of Colovia on the western edge of Cyrodiil. The borders of Hammerfell lie to the northwest. The Gold Coast and West Weald border the region to the south, and the Jerall Mountains and Great Forest are to the east. The town of Chorrol can be found in this region.
The Imperial Reserve is a grassland area extending across the southern section of the Colovian Highlands. It lies west of the Great Forest and extends west towards the Gold Coast. The Imperial Reserve is sparsely populated, containing only a few small hamlets such as Hackdirt and Weatherleah. The Reserve is prime hunting ground due to its flat land and sparse trees.
 Corbolo River
The Corbolo River is one of the largest tributaries of the Niben River, which it joins at the northeast corner of Niben Bay. It rises to the southwest of Cheydinhal, flowing southeast until it merges with its tributary, the Reed River, then south, then finally southwest.
Corinthe, also called Corinth, is a major city in the central region of Elsweyr. The city is a notable center of the Skooma trade, an operation overseen by Ya'Tirrje, the Gold Cat of Senchal himself. It was once home to a gladiatorial team known as the Brood. At one time, it housed a Dark Brotherhood sanctuary, which was closed in 4E 188.
 Crypt of Hearts
The Crypt of Hearts is a multi-level mausoleum located in northern Tamriel made up of dank, winding passageways filled with strange creatures. As befits such a place, its exact location is uncertain, having entrances in both High Rock and Skyrim. The city of Shornhelm is known as the Keeper of the crypt.
In 3E 397, due to the ongoing War of the Bend'r-mahk, a Shadow of Conflict was created deep within the crypt. This Shadow of Conflict, or "Umbra' Keth", could be controlled by a powerful Shadowmage. Pergan Asuul, one such Shadowmage, sought to control the monstrosity for his own ends, as did Jagar Tharn, who was posing as the Emperor Uriel Septim VII. An unknown hero, under the guidance of Azra Nightwielder and Skelos Undriel, recovered the seven Star Teeth in an effort to destroy the Umbra' Keth. The hero descended into the crypt on the Skyrim side of the border, near the city of Dragonstar. All but one of the crypt caretakers had fled, as the Umbra' Keth's presence had caused the dead to rise. The hero battled the final incarnation of Pergan Asuul in the crypt, and placed the Star Teeth on their pedestals in the Vault of the Heavens. The hero then lured the Umbra' Keth from the third level of the crypt and into range of the power of the Star Teeth, which weakened the shadow creature and allowed the hero to destroy it, preventing it from falling into the hands of Tharn, or anyone else who would misuse it.
The crypt was also used as a hiding place for one of the shattered pieces of the Staff of Chaos throughout the Imperial Simulacrum. The Eternal Champion, on a quest to dethrone Jagar Tharn, sought out the crypt. The Brotherhood of Seth in Camlorn, with the aid of a map that the champion recovered, were able to find an entrance to the crypt. The entrance was at the end of the northern bay in High Rock, near the city of Shornhelm. The champion recovered the piece of the staff on the fourth level of the crypt.
 Crystal Tower
The Crystal Tower (also called the Crystal-Like-Law) was an ancient, mystical structure located on Summerset Isle. It was built by the early Aldmer as a monument to their ancestors, and was considered sacred by the Altmer. Before the construction of the Arcane University, it was the pinnacle of magical learning in Tamriel. The top of the Crystal Tower was reserved for interring the dead. The southernmost tips of the Dragon's Teeth Mountains of mainland Tamriel could be seen from the top parapet of the tower. The tower seemingly existed in many other planes of existence. The interior of the tower was white and radiated light. It contained a Great Library and a treasury with many ancient tapestries and other relics. The Crystal Tower was famed for its animal pens, which held many different creatures from all across Tamriel.
I'ric Harad Egun was once the Archmagister of the tower. Tame trolls were employed as guards in the tower. During the Imperial Simulacrum, Jagar Tharn hid a piece of the fractured Staff of Chaos within the tower. The Eternal Champion located the tower by recovering a magical diamond from the Temple of the Mad God. The diamond was the source of power for the Mages Guild of Lillandril, and with the diamond the guild was able to locate the tower. The Eternal Champion entered the tower and recovered the piece of the Staff of Chaos. The tower was an early target for The Beautiful, but they failed to destroy it and moved on to easier targets. During the Oblivion Crisis (known to the Altmer as the Great Anguish), refugees fled to the Crystal Tower to fortify against the Daedra hordes. The Daedra broke through the refugees' defenses and used magic to topple the tower.
Cylarne was a ruin in the Shivering Isles at the end of the Third Era, located on the Isle of Flame. It is the oldest ruin in the Isles, and is rumored to be the former capital of the Shivering Isles. The ruins of Cylarne are home to the Cold Flame of Agnon, which is fed by the altars of Rapture and Despair.
In 3E 433, Sheogorath's Champion was sent to Cylarne to relight the Great Torch in New Sheoth, which was extinguished by the coming Greymarch. The Champion put an end to the conflict by manipulating a planned attack from the Saints, and brought the holy Flame back to New Sheoth.
Cyrodiil, also known as the Imperial Province, is a province in the south-central region of Tamriel, and the home of a humanoid race known as Imperials. The center of their Empire and seat of governance, Cyrodiil is also known as "the Heartland". The capital of Cyrodiil, and of the whole empire, the Imperial City, is located on an island in the center of the province, which bears the location of White Gold Tower, possibly the most renowned monument of Tamriel. Despite some accounts describing Cyrodiil as a jungle, it has primarily a temperate climate. Some attribute the discrepancy to the apotheosis of Emperor Tiber Septim.