Riau is a province located in the Sumatra island of Indonesia. The province is divided into two regencies, which are Rokan Hilir and Rokan Hulu. The capital city of Riau is Pekanbaru. The population of Riau is about 4.8 million, and the area of the province is about 48,000 square kilometers.
The history of Riau can be traced back to the 15th century. The first kingdom in Riau was the Sultanate of Siak. The Siak Sultanate was founded in …