The Singapore River is a river that flows parallel to Alexandra Road and feeds into the Marina Reservoir in the southern part of Singapore. The immediate upper watershed of the Singapore River is known as the Singapore River Planning Area, although the western part of the watershed is classified under the River Valley planning area.

River Valley is a planning area located within the Central Area of the Central Region of Singapore. The planning area shares boundaries with Orchard in the north, Museum in the east, Tanglin in the west, and Singapore River in the south.