AI Insight
On 27 September 2026, a large landslide occurred on the Kaligandaki River near Lete in Mustang district, Nepal, triggered by heavy rainfall in preceding days. The landslide temporarily blocked the valley, but the resulting dam breached within a short period, reducing downstream flood hazards. The exact location is estimated near coordinates 28.63113, 83.61219, though this remains uncertain, and it is unclear whether the event caused fatalities as it does not appear in Nepal's Bipad portal as a mass casualty incident.
Why it matters
Valley-blocking landslides can create temporary dams that pose significant flood risks to downstream communities when they fail. The rapid breach in this case appears to have minimized casualties, but such events highlight the need for monitoring systems in mountainous regions experiencing heavy rainfall, particularly along major river corridors like the Kaligandaki.
Understand the Science
Videos show a large landslide on the Kaligandaki River at Lete in Mustang.
On 27 September 2026, a large landslide occurred on the Kaligandaki River in Nepal. The landslide, which was triggered by heavy rainfall over the last few days, has been widely shared on social media. The Straits Times has posted a version to Youtube, although there are many more versions on social media platforms. I note also that all of these reports are somewhat vague:-
The location is reported to be Lete, although this is difficult to pin down. It appears to be in the area of [28.63113, 83.61219], although this is peculation. The image below is the Google Earth representation of the terrain in the area of Lete:-
The landslide appears to have been valley-blocking, but news reports suggest that the breach event occurred within a short period, minimising the hazard.
There is some uncertainty as to whether this landslide caused loss of life. At present, it does not appear on the Bipad portal as a mass fatality event.
Text © 2026. The authors. CC BY-NC-ND 3.0
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Source: The 27 September 2026 landslide on the Kaligandaki River in Nepal