The river flows through Maharashtra and Gujarat states, as well as the Union territory of Dadra and Nagar Haveli and Daman and Diu.

[7] The Daman Ganga, also known as Dawan River, rises in the Sahyadri hills close to Ambegaon village in Dindori taluka of Nasik district of Maharashtra State.

Some major tributaries which rise in and flow through the mountainous region of the states of Maharashtra, Gujarat and the Union Territory of Dadra and Nagar Haveli and Daman and Diu are the Dawan, the Shrimant, the Val, the Rayate, the Lendi, the Wagh, the Sakartond, the Roshni, the Dudhni, and the Piperiya.

of Gujarat and Union Territory of Dadra and Nagar Haveli and Daman and Diu (DNHDD).

The storage of this project is shared by the riparian state of Gujarat and Union Territory of DNHDD as the beneficiary region.

The masonry dam of 58.6 m height has a spillway in the gorge section of the river of 350 m length; the spillway, with an ogee shape and a roller bucket for energy dissipation, is designed to rout[clarification needed] a Probable Maximum Flood (PMF) discharge of 25,850 m3/s controlled by 10 radial gates each of size 15.55 by 14.02 metres (51.0 ft × 46.0 ft).

[11] The Gross Command Area (GCA) is 77,935 hectares (192,580 acres) and the Cultural Command Area (CCA) of the irrigation is 5,118 hectares (12,650 acres) on the left and right bank canal network benefiting the states of Gujarat, Dadra and Nagar Haveli and Daman.

[13] The Government of India's National Water Development Authority (NWDA) has proposed the Daman Ganga-Pinjal River Linking Project linking the Daman Ganga River to the Pinjal reservoir on the Pinjal River to the south, in the Vaitarna basin allowing surplus water from the Daman Ganga to be diverted south to Mumbai via the Pinjal reservoir.

The reservoirs will be linked by a pressure tunnel 16.85 kilometres (10.47 mi) long and 5 metres (16 ft) wide.

According to the Central Pollution Control Board's report the BOD value recorded at its monitoring station downstream of Kachogaon was a high of 30 mg/L.

[16] According to a study report of the Machhimar Adhikar Rahstriya Abhiyan due to the industrial effluents from Vapi town the dissolved oxygen level is very low and Mercury content in the groundwater in the town is about ninety-six times higher than the standards prescribed by the World Health Organization (WHO).

This has resulted in pollution of the seawater to a limit of five nautical miles (9 km), seriously affecting fish life.