The Hongu River is a major river and valley in the Sankhuwasawa District of Koshi Province in Nepal. It is a tributary of the Hinku River, which subsequently flows into the Dudh Kosi.^[1]

The Hongu Valley is at the back of the Everest region. It has views of the peaks of Everest, Lhotse, Nuptse and Ama Dablam. The Hongu basin is a river valley which feeds a group of lakes. The Hongu region offers one of the finest wilderness treks in Nepal where even huts and herds are rarely seen.^[2] Mera Peak, a popular trekking peak at 6,654 metres (21,831 ft) is located in Hinku valley, leading to the increasing tourism of this area.^[3]

Both the Hongu and Hinku valleys remain uninhabited, although there are kharka in the upper Hinku basin where Sherpas from the south, near Pangkongma, graze their animals during the grass-growing monsoon.^[4]