Bheri

The Bheri is a major river of western Nepal and the largest tributary of the Karnali, the country's longest river. It rises in the western part of the Dhaulagiri Himalaya and drains the eastern part of the Karnali catchment, running roughly 264 kilometres (164 mi) from its high mountain headwaters down to its junction with the Karnali. Along the way it crosses some of the most rugged and remote terrain in the country, descending from the trans-Himalayan plateau of Dolpa through the Mahabharat (Lesser Himalaya) ranges to the inner valleys of Karnali Province.

The river is formed by the union of two principal headstreams. The Thuli Bheri ('Great Bheri') begins in the Chharka region of Dolpa District, where it is first known as the Bhergung Khola, and drains the northern slopes of the Dhaulagiri massif, flowing past Dunai, the district headquarters of Dolpa. The Sani Bheri ('Little Bheri') drains the southern slopes of the same range. A third important upper tributary, the Uttar Ganga, drains the Dhorpatan Valley to the south of the Dhaulagiris. The Thuli Bheri and Sani Bheri meet at Rimna (Rimnaghat / Rimna Dobhan), near the border of Rukum West and Jajarkot districts, to form the main stem of the Bheri.

From Rimna the combined river flows generally westward and south-westward through the middle hills, passing along the margins of Jajarkot, Salyan and Surkhet districts. It traverses the Surkhet Valley before cutting through the Mahabharat Range and joining the Karnali River in the Lesser Himalaya, in the Surkhet area. Below this point the combined Karnali continues south toward the Terai and ultimately into India, where it becomes part of the Ghaghara system feeding the Ganges.

The Bheri is a classic Himalayan river whose flow is fed by a mixture of monsoon rainfall, high-altitude snowmelt and, in its uppermost reaches, glacial meltwater from the Dhaulagiri ice fields. Its regime is strongly seasonal: discharge swells dramatically during the summer monsoon (roughly June to September) when the river runs high, brown and powerful, and falls back to clear, lower flows through the autumn, winter and spring dry season. This seasonal contrast shapes everything from sediment transport and fish migration to the timing of rafting and the river's suitability for irrigation diversion.

The river's drainage is organised around its three named upper tributaries. The Thuli Bheri carries the waters of northern Dolpa and the northern Dhaulagiri flank; the Sani Bheri gathers the southern Dhaulagiri slopes; and the Uttar Ganga drains the high Dhorpatan Valley. The confluence of the Thuli and Sani Bheri at Rimna marks the true beginning of the Bheri proper, and the meeting of clear and silt-laden waters there has long made the spot a recognisable landmark. Numerous smaller hill streams (kholas) join the river as it descends through Rukum West, Jajarkot, Salyan and Surkhet.

As the Karnali's principal tributary, the Bheri contributes a substantial share of the Karnali system's total flow, and the river's volume and steady gradient through the hills are precisely what make it attractive for inter-basin water transfer and hydropower development described below.

The Bheri is at the centre of the Bheri Babai Diversion Multipurpose Project (BBDMP), Nepal's first major inter-basin water-transfer scheme. Located in Surkhet District of Karnali Province, the project diverts water from the Bheri River across the watershed into the Babai River so that it can be used for year-round irrigation and power generation in the dry western Terai. Water is taken from the Bheri behind a diversion dam at Chiple, in Bheriganga Municipality, and carried under a head of about 150 metres through a long tunnel to the Babai basin.

The project's headline engineering achievement is its roughly 12-kilometre headrace tunnel, which was the first tunnel in Nepal to be excavated with a tunnel boring machine (TBM). The bore was holed through on 16 April 2019, completing the tunnel ahead of schedule and demonstrating TBM technology in the Nepali Himalaya for the first time. The design discharge to be transferred is about 40 cubic metres per second.

The intended benefits are twofold. The diverted water is meant to provide round-the-year irrigation to roughly 51,000 hectares of farmland in Banke and Bardiya districts, transforming agriculture in a region that has historically depended on uncertain monsoon rains and a single annual crop. The drop between the tunnel outlet and the irrigation command area is also harnessed for hydropower, with a planned installed capacity in the order of 46.8 MW. Despite the early tunnel success, however, the wider project has faced repeated delays in its dam, powerhouse and canal works; by the mid-2020s authorities were projecting that actual diversion of water from the Bheri to the Babai would begin only around fiscal year 2027-28. Beyond the diversion scheme, the river and its banks also support local livelihoods through fishing and the seasonal extraction of sand and gravel.

Like most major rivers in Nepal, the Bheri carries cultural and religious weight for the communities along its banks, where river confluences (dobhan) are traditionally regarded as sacred. The meeting of the Thuli Bheri and Sani Bheri at Rimna is the most prominent such site on the river: Rimna Dobhan holds religious, cultural and commercial significance and has grown into a local market hub, with fish among its prime commodities.

Hindu festivals observed by riverside communities include Dashain, Teej and Maha Shivaratri, and the locality hosts a fair at the Bheri confluence, drawing people for worship and trade. The river valleys it threads — from the Buddhist, trans-Himalayan culture of Dolpa in the north to the predominantly Hindu hill communities downstream — give the Bheri corridor a notable cultural diversity.

The river is also central to the identity and economy of the Badi community, a marginalised group of the mid-western hills, many of whom have historically depended on fishing in the Bheri and on collecting and selling its sand. Community members have described the river as a livelihood anchor that helped keep local youth from having to migrate abroad for work, underscoring how closely social life along the Bheri is tied to a healthy river.

The Bheri's natural environment is under growing pressure, most visibly from unregulated extraction of sand and gravel from its bed. News reporting from Karnali Province has documented bulldozers being used to dig sand and aggregate from the river, a practice that alters the river's flow and channel and is reported to threaten nearby settlements. Riverside families who once earned modest daily incomes from collecting sand by hand now face dwindling and less profitable deposits as mechanised extraction expands.

Fish populations have declined sharply, with serious consequences for the fishing communities that depend on them. Local fishers report that catches that once reached around 20 kilograms a day have fallen so far that even 5 kilograms is now rare, and that once-common large fish have become scarce; fish prices have risen several-fold as supply has collapsed. Destructive practices such as electrofishing and the use of poison are blamed for driving native species toward local extinction. Conservationists and environmental experts quoted in the press have warned that rivers like the Bheri are vital to the region's economy, ecology and culture, and that ignoring environmental-impact assessment requirements risks ecological imbalance.

The river is also associated with physical hazards typical of steep Himalayan watercourses, including powerful monsoon flows and bank instability. A notable disaster occurred on 25 December 2007 when a steel suspension footbridge spanning the Bheri collapsed at Chhinchu (Mehelkuna), killing at least 15 people and injuring more than 20. At the same time the Bheri's clear water, dramatic gorges and Class II-IV rapids make it a destination for white-water rafting and kayaking — multi-day trips run through remote forested canyons rich in wildlife, and the river is known to anglers for its mahseer — so balancing tourism, fisheries, infrastructure and conservation is an increasingly important challenge for the Bheri basin.