Wanderlust World Wanderlust World The Caspian Sea lies north of the Persian Gulf. It is the world's largest inland water body (371,000 km²), bordered by Iran, Russia, Azerbaijan, Kazakhstan, and Turkmenistan. Though called a "sea," it is an endorheic lake—no outlet to the ocean.
The Persian Gulf is a marginal sea of the Indian Ocean between Iran and the Arabian Peninsula. The two are separated by the Iranian Plateau and the Zagros Mountains.