Rebun Island is an island in the Sea of Japan off the northwestern tip of Hokkaidō, Japan. The island sits 50 kilometres off the coast of Hokkaidō. Rebun stretches 29 kilometres from north to south and 8 kilometres from east to west. The island covers approximately 80 square kilometres. Rebun Island is located 10 kilometres northwest of Rishiri Island, an…Rebun Island is an island in the Sea of Japan off the northwestern tip of Hokkaidō, Japan. The island sits 50 kilometres off the coast of Hokkaidō. Rebun stretches 29 kilometres from north to south and 8 kilometres from east to west. The island covers approximately 80 square kilometres. Rebun Island is located 10 kilometres northwest of Rishiri Island, and the two islands are separated by the Rebun Channel.