The Kallang River is the longest river in Singapore, flowing for 10 kilometers from the Lower Peirce Reservoir to the Kallang Basin. 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.

Bishan, also known as Peck San, Bishan New Town or Bishan Town, is a planning area and matured residential town located at the northernmost portion of the Central Region of Singapore. Statistically, the area is ranked the 38th biggest in terms of geographical size and the 22nd most populated planning area in the country. It is located at the most Central point of Singapore, and it comprises Upper Thomson, Marymount, Shunfu, Sin Ming, Bishan North and Bishan East. There are also many private residential properties in Bishan. Bishan is ranked 15th in terms of population density. Apart from its boundary with the Central Water Catchment in the west, Bishan borders three other planning areas: Ang Mo Kio to the north, Toa Payoh to the south, and Serangoon to the east.