間宮海峡
Sakhalin is separated from the mainland by the narrow and shallow Strait of Tartary, which often freezes in winter in its narrower part, and from Hokkaido, Japan, by the Soya Strait or La Pérouse Strait. Sakhalin is the largest island in Russia, being long, and wide, with an area of . It lies at similar latitudes to England, Wales and Ireland.