The Kamala River (Hindi and Nepali: कमला नदी; romanized: Kamalā nadī) originates in Nepal and flows through the Indian state of Bihar.

[3] The Tao and Baijnath Khola rivers merge with the Kamala at Maini[4] It enters Indian territory in Madhubani district in Bihar, 3.5 kilometres (2.2 mi) upstream of Jainagar.

It joins the river Kareh (Bagmati) at Badlaghat in Khagaria district[1] and the combined stream flows into the Koshi nearby.

[2] The main tributaries of the Kamala River are the Tao, Baijnath Khola,[4] Mainawati, Dhauri, Soni, Balan, Trisula, and Chadaha.

[7] The plains of Bihar, adjoining Nepal, are drained by a number of rivers that have their catchments in the steep and geologically nascent Himalayas.

The project would provide year-round irrigation facilities and generate hydropower with an installed capacity of 30 MW.

In 1998, earthquake zone was Darbhanga that is only 60 kilometres (37 mi) from the borders of Nepal where big dams are being proposed.