Perak River (Malay: Sungai Perak) is the second longest river in Peninsular Malaysia after Pahang River in Pahang, Malaysia. A number of towns are on the banks of the river including the royal town of Kuala Kangsar. Most of the settlements in what is today Perak were situated near the river until the 19th century, when tin deposits were discovered elsewhere, most notably Ipoh. The source of Sungei Perak is in the mountainous Perak-Kelantan-Thailand border of the Belum Forest Reserve. Some of the branches of the river are the Bidor River and the Kinta River.