Batam is the largest city (kota) of Riau Islands Province of Indonesia as well the name of an island. The city of Batam administrative area covers several islands: Batam Island is the core urban and industrial zone. Both Galang Island and Rempang Island are connected to Batam Island by short bridges, the 3 islands are collectively called Barelang. These latter two islands maintain their rural character, as does nearby Bulan Island, also administered as part of the municipality (kota). Batam is an industrial boomtown, an emerging transport hub, and part of a free trade zone the Indonesia–Malaysia–Singapore Growth Triangle, located 20 km (12 mi) off Singapore's south coast and also part of the Indonesia–Malaysia–Thailand Growth Triangle.