Tambelan archipelago is a group of islands off the west coast of West Kalimantan, (Borneo), Indonesia, just north of the equator. Geographically they are part of the Tudjuh Archipelago, and administratively part of the Riau Islands Province. Major islands include Big Tambelan (Tambelan Besar), Mendarik, Uwi, Benua, and Pejantan. ...