The Caspian Sea is the largest landlocked sea in the world. It is surrounded by Kazakhstan to the northeast, Turkmenistan to the east, and Iran to the south. It is also bordered by Azerbaijan to the west, and Russia to the northwest.
The Caspian Sea covers about 143,000 square miles, which is slightly smaller than the size of Montana. It is home to over 800 different animal and 500 plant species, and many of the species are only found there.