Why the Bhote Koshi keeps flooding, and why a warming Himalaya makes it worse

Climate & Environment No single cause is confirmed yet — scientists are weighing an earthquake-triggered landslide, an ice-rock avalanche and a draining glacial lake… By Laxman Rawal · Aug 26, 2026 Read the full story

📍 Developing story — live updates The 2026 Nepal floods are a developing, nationwide emergency and figures are rising. For the latest verified death toll, missing and rescued numbers, and trek status, follow our continuously-updated Nepal Floods 2026: Live… Travel Himalaya Nepal · News Read the full story

What actually came down the valley

The maximum flooding was on the Lhende Khola , a tributary of the Bhote Koshi, with the trigger point roughly 25 km inside Tibet . From there the water funnelled through the Rasuwagadhi–Gyirong (Kerung) border zone and into Nepal. Whatever set it off happened… Travel Himalaya Nepal · News Read the full story

Three explanations, and none confirmed yet

Travel Himalaya Nepal · News Read the full story

A supraglacial lake — a pond on top of the ice

A supraglacial lake forms on the surface of a glacier, where meltwater collects in ponds that expand and merge into a larger body of water sitting directly on the ice. Because its bed and its banks are ice rather than rock, such a lake can fail suddenly: the… Travel Himalaya Nepal · News Read the full story

An ice-rock avalanche — a natural dam that fails

In the second reading, favoured by ICIMOD's Saswata Sanyal and Sarthak Shrestha , a mass of rock and ice broke off a glacier and crashed into the valley floor. Debris on that scale can pile across a river and pond a lake behind it — a temporary, unstable… Travel Himalaya Nepal · News Read the full story

An earthquake that shook the slope loose

The third explanation ties the flood to the ground itself moving. Foreign Minister Shishir Khanal has said an earthquake triggered the avalanche or landslide that blocked the Bhote Koshi. The USGS recorded an mb 4.4 earthquake in Tibet, and roughly seven… Travel Himalaya Nepal · News Read the full story

A river that flooded twice in fourteen months

This is the part that should give pause to anyone who lives, trades or treks below these valleys. The Bhote Koshi and its Lhende tributary flooded once already, in July 2025 — a flood attributed at the time to drainage from a supraglacial lake in Tibet. That… Travel Himalaya Nepal · News Read the full story

What it means on the ground

Syabrubesi is the road-head where essentially every Langtang Valley trek begins, reached by the Pasang Lhamu Highway from Kathmandu, and Timure sits on the Rasuwagadhi border road — so this flood struck the gateway to Langtang and the main overland route… Travel Himalaya Nepal · News Read the full story

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