The Perak River (Malay: Sungai Perak) is the second longest river in Peninsular Malaysia after the Pahang River.
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 Titiwangsa Mountains (Malay: Banjaran Titiwangsa, pronounced [ˈband͡ʒaˈran titiwaŋˈsa]), also known as Banjaran Besar (lit. 'main range') by locals, is the chain of mountains that forms the backbone of the Malay Peninsula. The northern section of the range is in southern Thailand, where it is known as the Sankalakhiri Range (Thai: ทิวเขาสันกาลาคีรี; RTGS: Thio Khao Sankalakhiri; pronounced [tʰīw kʰǎw sǎn.kāːlāːkʰīːrīː]).
The mountain range acts as a natural divider, dividing Peninsular Malaysia, as well as southernmost Thailand, into east and west coast regions. It also serves as a drainage divide of some major rivers of Peninsular Malaysia such as the Pahang, Perak, Kelantan, Klang and Muar. The length of mountain range is about 480 km from north to south.
The Kelantan River (Malay: Sungai Kelantan, Kelantanese: Sunga Klate) is a major river in Kelantan, Malaysia. Its drainage basin is about 11,900 km² in northeast Malaysia, including part of the Taman Negara, and flows northwards into the South China Sea. The rainfall over the area varies between 0 mm in the dry season (March–May) to 1,750 mm in the monsoon season (November–January). The average runoff from the area is about 500 m³/s. It is the second longest river in the east coast region and fourth longest river in Peninsular Malaysia behind the Pahang, Perak and Muar, at the length of 248 kilometres (154 mi).
The Muar River (Malay: Sungai Muar) is a river which flows through the states of Negeri Sembilan and Johor in Malaysia. Its drainage basin encompasses the states aforementioned, as well as Pahang and Malacca.
Measuring around 250 km (155 mi) in length, the Muar is the third longest river in Peninsular Malaysia after the rivers of Pahang and Perak, slightly longer than the Kelantan River. It is one of the two major Negri rivers, the other being the Linggi, as well as the second most significantly important river in Johor after the Johor River.