Satellite imagery obtained from intelligence and imaging firms has documented widespread destruction across Nepal’s Trishuli River valley resulting from a flash flood triggered by a glacier collapse on Wednesday. Nepalese authorities report more than 550 deaths, with hundreds of additional people unaccounted for in the aftermath.
Before-and-after satellite images show significant damage concentrated in several key areas. A major Nepal-Tibet border crossing was largely obliterated by floodwaters, with video evidence capturing the moment buildings were engulfed. Downstream, the village of Timure has largely disappeared, with most structures on the surrounding steep valley walls either destroyed or buried under mud. Further south near Syapru Besi, satellite imagery indicates the village is now covered in mud, rock, and debris, with bridges and a hydroelectric power station among destroyed infrastructure. The town of Trishuli, located approximately 28 miles downstream from the border, experienced substantial damage to an entire neighborhood, documented in verified videos showing a bridge collapse and residents attempting to flee the advancing floodwaters.
Satellite imagery from Planet Labs and drone video have captured the event’s origins at the collapsed glacier site. The images show an enormous section of glacier detached, creating a destructive path where water and debris surged through the valley, with vegetation stripped at heights exceeding 300 meters above the riverbed. A barrier lake has formed at the base of the landslide path, which Chinese authorities have flagged as a potential source of additional flooding. A glaciologist consulted by BBC Verify indicated the lake’s water volume appeared to have stabilized, with visible drainage channels allowing water to escape downstream, though assessment of the barrier’s stability proved impossible from imagery alone.
The full extent of damage on the Tibetan side of the border remains unclear due to restricted foreign media access to the region. Satellite data has been released publicly to assist rescue and recovery operations in locating missing persons and assessing priority areas for intervention.
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