The Kallang River (Chinese: 加冷河, Malay: Sungei Kallang) is the longest river in Singapore, flowing for 10 kilometers from the Lower Peirce Reservoir (originally named "Kallang River Reservoir") to the Kallang Basin.[1] It originates in the planning area of Central Water Catchment, flows in a southeast direction through Bishan and Toa Payoh, before finally arriving in Kallang.
Prior to extensive land reclamation along Singapore's southeastern coast, the Kallang River used to empty into the Singapore Straits at the Kallang Basin, near where Merdeka Bridge is standing.[2] Today, the Kallang River flows into the open sea via the Marina Channel.
Tributaries of the Kallang River include Sungei Whampoa, the Pelton Canal, and the Bukit Timah Second Diversion Canal. Other rivers that empty into the Kallang Basin, other than the Kallang River, include the Geylang River and Rochor River. All these aforementioned waterways form part of the Marina Reservoir, as a result of the Marina Barrage.
The Kallang Park Connector of the Park Connector Network (PCN) runs almost parallel to the Kallang River, providing a stretch of recreational space along the river. The Kallang Riverside Park straddles both sides of the Kallang River near the river mouth.