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 km2), Aphaedo (44.3 km2), Bigeumdo (43.1 km2), Dochodo (40.3 km2), Imjado (43.2 km2), Amtaedo (38.7 km2), Jeungdo (37.2 km2), Jangsando (24.3 km2), Haui-do (16.1 km2), and Heuksando (19.7 km2). The sea area is a continental shelf with less than 15 meter in depth. Sinan County is known for its specialities - Skate (fish) and Cheonilyeom (천일염, a Korean type of sea salt).
In 2014, enslaveries on Sinan County's salt farms were discovered.