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Dumai is a coastal city in Riau Province on the island of Sumatra, Indonesia, about 188 km from Pekanbaru, the provincial capital. The city has an area of 2,063.24 km2 and had 358,365 inhabitants at the mid 2025 official estimate (comprising 184,124 males and 174,241 females). Dumai has a domestic airport, Pinang Kampai Airport. The city is an important transport and trade centre, both regionally and internationally, especially for traffic to and from Malaysia. The region is rich in oil (petroleum and palm oil).

Kota Dumai mempunyai keragaman suku dan budaya, selain memiliki budaya asli yaitu budaya Melayu. Keragaman yang ada merupakan aset yang bisa menghasilkan devisa. Kebudayaan Melayu dianggap sebagai "Roh Pembangunan Kota Dumai" dengan cara menjabarkan nilai-nilai budayanya sebagai inspirasi dan dasar pembangunan. Pelaksanaan pembangunan dibidang kebudayaan telah meningkatkan daya tarik/promosi daerah tentang seni budaya daerah.

Currently Dumai City is the second largest city in the province of Riau, but earlier it was a small hamlet on the east coast of Riau Province. It was inaugurated as a city on 20 April 1999, by Law no. 16 of year 1999, having previously been an administrative town in Bengkalis Regency.

Dumai has a tropical rainforest climate (Af) with heavy rainfall year-round.