Oki Islands (隠岐諸島, Oki-shotō, or 隠岐群島 Oki-guntō) is an archipelago in the Sea of Japan, which are administratively part of Oki District, Shimane Prefecture, Japan. The islands have a total area of 346.1 square kilometres (133.6 sq mi). Only four of the sixteen named islands are permanently inhabited. Much of the archipelago is within the borders of Daisen-Oki National Park.