Kundur Island is an island within the Riau Archipelago, part of the Riau Islands Province of Indonesia. It lies at about 80 kilometres southwest of Singapore, 76 kilometres (47 mi) southwest of Batam, 32 kilometres (20 mi) south of Great Karimun Island, 172 kilometres (107 mi) northwest of Lingga Islands and 120 kilometres (75 mi) west of Tanjung Pinang. It has an area of about 795 square kilometres (307 sq mi), including Buru District and other minor surrounding islands. According to the 2010 Census population, the population of Kundur Island was 67,090; the official estimate as at mid 2023 was 91,463. As Kundur does not have an airport, all visitors arrive by ferry.