Rupat is an island in the Strait of Malacca, and forms part of Bengkalis Regency within Riau Province of Indonesia. It lies just off the eastern coast of Sumatra, across from Dumai city, from which it is separated by the Strait of Rupat (Selat Rupat). Its area is 1,490  km². With a population of some 30,000, the island is sparsely populated, with a population density of 20 per km². Rupat was one of thousands of abandoned islands, but now the population is growing year after year.