The Ulhas River is a major river flowing through Mumbai, India. This river suffers from pollution because of industry and urban development along its length making it of interest to researchers, industry and the environmental regulatory community. 

The estuary of the Ulhas is the site of the historical ports of Kalyan, Kopri and Sopara. The total length of the river from its origin to its outfall in the Arabian sea is 122 km. In terms of water quality in the riverine system, the sources of environmental pollution were identified as untreated sewage and industrial effluents passing into the riverine system of Ulhas River. 

Downstream from the city of Kalyan the river, nearly flowing at sea level, merges with the creek waters and its flow comes to be dictated by the tidal forces. From here on it forms an estuary and also supports a mangrove forest near Diva-Dombivali. In rainy season and during low tide the river continues to flow till Thane where splits into two branches which flow west and south, respectively, around Salsette Island, on which lies the metropolis of Mumbai. The main branch turns northwestward to Ghodbunder, where it opens into the estuary of Vasai Creek. Thane Creek flows south to empty into Bombay Harbour. 

(Source Wikipedia) 

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