Ghaghra Sub-basin

 

The geographical extent of the Ghaghara sub-basin lies between 79 29' to 84 49 east longitudes and 25 47' to 30 31' north latitudes of the country. The main river the Ghaghara and the Sarda, the Rapti, and the Little Gandak are some of the major tributaries flowing in this sub-basin. The Ghaghara river originates at an elevation of 4,800 m near Manasarowar Lake. The river is also known as Manchu and Karnali in Nepal. After flowing for about 72 km in a south-easterly direction, the river enters Nepal. Ghaghara enters into India at Kotia Ghat near Royal Bardia National Park, Nepal Ganj, where it is known as the river Girwa for about 25 km. The total catchment area of the Ghaghara river is 1,27,950 Sq.km, out of which 45 percent falls in India. The Ghaghara sub-basin of Ganga basin has a total catchment area of 58,634 Sq.km. The Sarda river is the important tributary of Ghaghara river, which forms the boundary between India and Nepal for some distance. The Sarju, Rapti and Little Gandak are the other important tributaries of the Ghaghara river. The total length of Ghaghara river before its confluence with Ganga river (at Doriganj downstream of Chhapra town in Bihar) is 1,080 km.  It drains into the states of Uttar Pradesh, Uttarakhand and parts of Bihar. The sub basin map is shown below:

 

(Source: India-WRIS)