Dumai is a city in Riau province on the island of Sumatra, Indonesia. The city has an area of 2,039.35 km² and had 293,355 inhabitants in 2012. Dumai has a National Airport, that is Pinang Kampai Airport. Dumai is an important transport and trade centre, both regionally and internationally, especially to Malaysia. Dumai is rich in oil (fuel and palm oil).