Amami Oshima is one of the Satsunan Islands, and is the largest island within the Amami archipelago between Kyushu and Okinawa. Much of the island is within the borders of the Amami Gunto Quasi-National Park. Amami Oshima is the seventh largest island in the Japanese archipelago after the four main islands, Okinawa Island and Sado Island It is located approximately 210 mi south of the southern tip of Kyushu and 130 mi north of Okinawa. The island is of volcanic origin and the coast of the island is surrounded by a coral reef. It is surrounded by the East China Sea on the west and the Pacific Ocean on the east. The climate of Amami Oshima is classified as has a humid subtropical climate Köppen climate classification with very warm summers and mild winters. The rainy season lasts from May through September.