How large is the Caspian Sea?
Caspian Sea
The wide and endorheic Caspian Sea has a north–south orientation and its main freshwater inflow, the Volga River, enters at the shallow north end. Two deep basins occupy its central and southern areas. These facts lead to horizontal differences in temperature, salinity, and ecology. The Caspian Sea spreads out over nearly 750 miles (1,200 km) from north to south, with an average width of 200 miles (320 km). It covers a region of around 149,200 square miles (386,400 square km)—bigger than the region of Japan—and its surface is about 90 feet (27 meters) below sea level. The sea bed in the southern part reaches as low as 1,023 m (3,356 ft) below sea level, which is the second lowest natural depression on earth after Lake Baikal (−1,180 m, −3,871 ft). The ancient inhabitants of its coast perceived the Caspian Sea as an ocean, probably because of its saltiness and large size.
Atlantic Ocean
Including its marginal seas, the Atlantic covers an area of 106,460,000km2 (41,100,000sqmi) or 23.5% of the global ocean and has a volume of 310,410,900km3 (74,471,500cumi) or 23.3% of the total volume of the earth's oceans. Excluding its marginal seas, the Atlantic covers 81,760,000km2 (31,570,000sqmi) and has a volume of 305,811,900km3 (73,368,200cumi). The North Atlantic covers 41,490,000km2 (16,020,000sqmi) (11.5%) and the South Atlantic 40,270,000km2 (15,550,000sqmi) (11.1%).[4] The average depth is 3,646m (11,962ft) and the maximum depth, the Milwaukee Deep in the Puerto Rico Trench, is 8,486m (27,841ft).[4][15]