The river basin (part of the basin of West flowing rivers from Tapi to Tadri), which lies entirely on the western ghats, has a total catchment area of . Catchment area distribution is: In the Nashik district of Maharashtra (60.74%); in the Valsad district in Gujarat (21.36%); and in the Union territory of Dadra and Nagar Haveli and Daman and Diu it is (17.90%). The mean annual run off from the catchment is 3,771 MCM (million cubic metres). The upstream area of the river is hilly and covered with forest . Rain fall occurs during the monsoon months from June to September with an annual average rainfall incidence of approximately (maximum recorded is reported to be .}. The soil conditions in the basin are categorized as "reddish brown soil, coarse shallow soil, deep black soil and Coastal alluvial soil". Silvassa, Vapi and Daman are the major towns on the banks of the river.