Dahisar River is a river in the northern suburbs of Mumbai near the suburb of Dahisar. It originates in the Tulsi Lake in the Sanjay Gandhi National Park in the northern reaches of the city. The river is currently highly polluted with the dumping of industrial effluents from workshops, and sewage from slums and stormwater drains into it. The river was once so picturesque that Hindi films were shot here. During 1956-57, crocodiles were witnessesed to be residing the river.. The river empties into the Manori Creek.
In recent times narrowed down, and become more shallow due to the presence of the accumulation of silt, debris and plastic bags. After the 2005 Maharashtra floods, where the 100 people lost their lives in the flooding that ensued, the BMC has undertaken a desilting and widening project to cleanup the river and prevent flooding in 2006.