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.
Singapore River planning area sits within Singapore's Central Area of the Central Region, as defined by the Urban Redevelopment Authority. The planning area shares boundaries with the following – River Valley and Museum to the north, Tanglin and Bukit Merah to the west, Outram to the south, and the Downtown Core to the east. The planning area is split into the three wharfs or quays in the area, Robertson Quay being the largest and most upstream, followed by Clarke Quay and Boat Quay.