Cirtiritashpi is a tiny cave in the Molagreahd leading to a ruined daedric shrine. The easiest way to find it is to head south-southeast along the Amurbal Peninsula from Tel Oren. The entrance to the cave can be found in the center of the peninsula after it joins the mainland.
There is little of interest in the cave. Pumaris Dulay guards a stash of loot consisting of 100 gold, two scrolls and two books plus a couple of miscellaneous items.