The island of Hokkaidō is located in the north of Japan, near Russia (Sakhalin Oblast). It has coastlines on the Sea of Japan (to the west of the island), the Sea of Okhotsk (to the north), and the Pacific Ocean (to the east). The center of the island is mountainous, with volcanic plateaux. Hokkaidō has multiple plains such as the Ishikari Plain 3,800 km2 (1,500 sq mi), Tokachi Plain 3,600 km2 (1,400 sq mi), the 2,510 km2 (970 sq mi) (the largest wetland in Japan) and Sarobetsu Plain 200 km2 (77 sq mi). Hokkaidō is 83,423.84 km2 (32,210.12 sq mi) which make it the second-largest island of Japan.