WEBApr 19, 2024 · A mosque in Baku, Azerbaijan, near the shore of the Caspian Sea. The elongated sea sprawls for nearly 750 miles (1,200 km) from north to south, although its average width is only 200 miles (320 km). It covers an area of about 149,200 square miles (386,400 square km)—larger than the area of Japan—and its surface lies some 90 feet …