The Indragiri Hilir Regency has a fairly long history before the Dutch colonial period. Quite a lot of power shifts while still in the kingdom. Starting from Keritang Kingdom, Kemuning Kingdom, Batin Enam Suku Kingdom to Indragiri Kingdom. besides having an interesting history, Indragiri Hilir Regency also has interesting tourist attractions, and one of them is Solop Beach which is also a mainstay of tourist attractions in Riau. As Indragiri Hilir was once the seat of the Indragiri Sultanate, there are many relics from the sultanate than can be still found throughout the region, such as the Indragiri Kings Cemetery in Rengat and traditional houses with typical Malay architecture. Moreover, Indragiri Hilir is also known for its many waterfalls. Similar to Indragiri Hilir, the Indragiri Hulu Regency is filled of many tourism spots, such as waterfalls and relic of ancient Malay kingdoms. Furthermore, Indragiri Hulu also serves as the gateway to the Bukit Tigapuluh National Park.