[6] Both Sunkoshi and Bhote Koshi river courses together form one basin that covers an area of about 3,394 km2 (1,310 sq mi).

[8] The Tamur and the Arun rivers join the Sunkoshi at Tribenighat to form the Saptkoshi, which flows through the Chatra Gorge across the Mahabharat Range on to the Gangetic plain.

The Saptkoshi River flows through the Chatra Gorge in a southerly direction into northern Bihar and joins the Ganges.

[6] On 2 August 2014, a landslide at Jure blocked the river downstream from Barabise and created a large lake that submerged a hydropower station.

This huge rockslide of approximately 5,000,000 m3 (180,000,000 cu ft) blocked the Sunkoshi River upstream of Jure village.

[18] The first successful descent of the Sunkoshi was made in late September 1970 by Daniel C. Taylor, Terry Bech, Cheri Bremer-Kamp, and Carl Schiffler.