The island of Hokkaido 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. Hokkaido has multiple plains such as the Ishikari Plain , Tokachi Plain , the Kushiro Plain (the largest wetland in Japan) and Sarobetsu Plain . Hokkaido is which make it the second-largest island of Japan.