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The Singapore River is a small river in Singapore with great historical importance. The Singapore River flows from the Central Area, which lies in the Central Region in the southern part of Singapore before emptying into the ocean. The immediate upper watershed of the Singapore River is known as the Singapore River Planning Area, although the northernmost part of the watershed becomes River Valley. As the Central Area is treated as a central business district, nearly all land surrounding it is commercial. It is one of about 90 rivers in Singapore and its islands. It is the place where Raffles made as the 1st trading port in Singapore.
Pollution
The Singapore River is the most famous river in Singapore. Starting in the 1880s, there was heavy traffic on the Singapore River due to rapid urbanization and expanding trade. At the same time, it brought in water pollution caused by the disposal of garbage, sewage and other by-products of industries located along the river's banks. The sources of water pollution into the Singapore River and Kallang Basin included pig wastes from pig and duck farms, unsewered premises, street hawkers and vegetable wholesaling. Riverine activities such as transport, boat building and repairs were also found along the Singapore River. Some 750 lighters plied along the Singapore River and Kallang Basin in 1977. Waste, oil spills and wastewater from these boats and lighters added to the pollution of the rivers. By October 1977, an action plan on "The Clean-up of the Singapore River and Kallang Basin" was submitted to the Prime Minister. By late 1977, the government was starting to take action to clean up the river. The plan involved the development of infrastructure such as housing, industrial workshops and sewage; massive resettlement of squatters, backyard trades and industries and farmers; re-sitting of street hawkers to food centers; and phasing out activities that pollute the water.

Singapore River today
The river is now part of the Marina Reservoir after damming the Singapore River at its outlet to the sea to create a new reservoir of freshwater. While damming this area would create a valuable source of fresh water for the tiny city-state, it would have prevented the docking of ocean-going ships at the Singapore River which was arguably the original reason Singapore came into existence. The dam is known as Barrage. Whereas the original mouth of the Singapore River emptied into Singapore Straits and its southern islands before major land reclamation took place, the Singapore River now empties into Marina Bay - an area of water partially enclosed by the reclamation work. The Port of Singapore is now located to the west of the island, using most of the south-west coast, and passenger ships to Singapore now typically berth at the Singapore Cruise Centre at HarbourFront. Thus the Singapore River's economic role has shifted away from one that of trade, towards more a role accommodated for tourism and aesthetics for the commercial zone which encloses it.