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Rokan Hulu (lit. Upper Rokan) is a regency (kabupaten) of Riau Province of Indonesia. It is located on the island of Sumatra. Rokan Hulu Regency was created on 4 October 1999 as a result of the division of Kampar Regency, of which it was previously the western 24%. The new Regency was established under Law No. 53 of 1999 and Law No. 11 of 2003 on changes to Law Decree No. 53 of 1999, which is reinforced by the Constitutional Court Decision No. 010 2004, dated 26 August 2004. It mainly occupies the upper part of the catchment area of the Rokan River, and has an area of 7,588.13 km². It had 474,843 inhabitants at the 2010 Census and 561,385 at the 2020 Census; the official estimate as at mid 2024 was 586,994 (comprising 298,478 males and 288,516 females). The administrative centre of the regency is located at the town of Pasir Pengaraian (with 4,753 inhabitants as at mid 2023) in Rambah District.

Benteng tujuh lapis Dalu-dalu Makam Raja-Raja Rambah Istana Rokan

Kabupaten Rokan Hulu memiliki wilayah yang terdiri dari 85% daratan dan 15% daerah perairan dan rawa. Secara geografis daerah ini berbatas dengan wilayah sebagai berikut:

Di Kabupaten Rokan Hulu terdapat beberapa sungai. Dua di antaranya adalah sungai yang cukup besar yaitu Sungai Rokan Kanan dan Sungai Rokan Kiri. Selain sungai besar tersebut, terdapat juga sungai-sungai kecil antara lain Sungai Tapung, Sungai Dantau, Sungai Ngaso, Sungai Batang Lubuh, Sungai Batang Sosa, Sungai Batang Kumu, Sungai Duo (Langkut), dan Sungai Siasam.