Caspian Sea sunk 5 feet in last 20 years: Study
Water levels in the Earth's largest inland water body, the Caspian Sea, have dropped nearly three inches per year from 1996-2015, almost five feet in total, according to a US-based study. The drop is likely due to the average annual surface temperature rising by 1ÂºC, compared to 1979-1995 period. The sea is surrounded by Russia, Kazakhstan, Turkmenistan, Iran, and Azerbaijan.