Small, overlooked glacial lakes are causing deadly floods in the Himalayas
Tiny glacial lakes that form and drain quickly are proving harder to detect and more dangerous than previously understood, researchers say, after a series of deadly floods across the Himalayas.
A glacial lake outburst flood, or GLOF, in Nepal killed at least nine to eleven people and left dozens missing in July 2025, destroying a major bridge on the border with China. The lake that triggered the flood had formed only months earlier and wasn't visible in satellite imagery beforehand, illustrating a growing risk from small glacial lakes that researchers say has been underestimated.
Similar small lakes have caused a string of floods across the region: one in Nepal's Thame village in August 2024 displaced more than 135 residents, and an ice-dammed lake in Upper Mustang sent floodwaters 35 kilometers downstream in June 2025, destroying four bridges. Nepal, China and India together have at least 47 glacial lakes considered potentially dangerous.
"Tiny and short-lived glacial lakes are becoming more hazardous than previously perceived," said Finu Shrestha of the International Centre for Integrated Mountain Development. Researchers say these lakes are difficult to monitor because they can form, fill and drain within a single monsoon season, when they're also hardest to spot by satellite. "It is not feasible to install monitoring equipment on every glacier across the region," Shrestha said, adding that the risk requires cross-border cooperation: "GLOFs do not recognise borders."
Based on reporting by Shalinee Kumari for Dialogue Earth, via Eco-Business. Read the original: https://www.eco-business.com/news/tiny-glacial-lakes-in-the-himalayas-pose-unexpected-flooding-threats/
This article was produced with the assistance of AI tools and reviewed by an editor before publication.
