Rishiri Island is an island in the Sea of Japan off the coast of Hokkaido, Japan. Administratively the island is part of Hokkaido Prefecture, and is divided between two towns, Rishiri and Rishirifuji. The island is formed by the cone-shaped extinct volcanic peak of Mount Rishiri. Along with Rebun Island and the coastal area of the Sarobetsu Plain, Rishiri forms the Rishiri-Rebun-Sarobetsu National Park. The main industries of Rishiri are tourism and fishing. The island is about 63 kilometres (39 mi) in circumference and covers 183 square kilometres (71 sq mi). The island has a population of 5,102 residents.