Bengkalis Island is an Indonesian island in Strait of Malacca in the Riau Islands province. The Straits of Malacca is a narrow stretch of water between Peninsular Malaysia (West Malaysia) and the Indonesian island of Sumatra. ... The Riau Islands (Kepulauan Riau (Kepri for short) or sometimes Riau Kepulauan in Bahasa Indonesia) are a province and a group of islands in Indonesia, located south of Singapore, off the eastern coast of Riau province on Sumatra island. ...