Caspian Sea
The Caspian has characteristics common to both seas and lakes. It is often listed as the world's largest lake, although it is not a freshwater lake. It contains about 3.5 times more water, by volume, than all five of North America's Great Lakes combined. The Caspian was once part of the Tethys Ocean, but became landlocked about 5.5 million years ago due to plate tectonics. The Volga River (about 80% of the inflow) and the Ural River discharge into the Caspian Sea, but it has no natural outflow other than by evaporation. Thus the Caspian ecosystem is a closed basin, with its own sea level history that is independent of the eustatic level of the world's oceans.
Caspian horse
The Caspian is a small horse breed native to Northern Iran. Although its original height probably ranged between it is termed a horse rather than a pony because, size apart, it has much in common with horses in terms of conformation, gaits and character. It is believed to be one of the oldest horse or pony breeds in the world, descended from small Mesopotamian equines that, in competition with larger animals, had faded from attention by the 7th century AD.