Kundur Island is an island within the Riau Archipelago, part of the Riau Islands Province of Indonesia. It lies at about 80 kilometres (50 mi) southwest of Singapore, 76 kilometres (47 mi) southwest of Batam, 32 kilometres (20 mi) south of Great Karimun, 172 kilometres (107 mi) northwest of Lingga Islands and 120 kilometres (75 mi) west of Tanjung Pinang. It has an area of about 304 square kilometres (117 sq mi), not including district Buru.