Sinan County (Sinan-gun) is a county in South Jeolla Province, South Korea. The county consists of 111 inhabited islands and 719 uninhabited islands. The number of islands in this county accounts for 25% of all islands in South Korea. Big islands among them are Anjwado (45.2㎢), Aphaedo (44.3㎢), Bigeumdo (43.1㎢), Dochodo (40.3㎢), Imjado (43.2㎢), Amtaedo (38.7㎢), Jeungdo (37.2㎢), Jangsando (24.3㎢), Haui-do (16.1㎢), and Heuksando (19.7㎢).