مازندران

Etymology
lit. 'the gate or the valley of the giants' from, from. The name has been used in to refer to a land inhabited by divs (daevas) and sorcerers and is difficult to conquer. On the other hand, after Muslim invasion of Persia, the region of Tabaristan remained unconquered for a relatively long period of time, which was later called (and mistaken for) Mazandaran.

Proper noun

 * 1) Tabaristan, Tapuria