BBC Verify maps Nepal‑Tibet flash flood path with verified video

BBC Verify has mapped the route of a destructive flash flood that swept through parts of Nepal and the Tibet Autonomous Region, using a series of verified video recordings. The flood, which began on 12 July after a sudden glacial lake outburst in the Himalayas, inundated downstream valleys, destroying homes, bridges and agricultural land across several districts in eastern Nepal before crossing the border into Tibet. Initial reports from local authorities indicated at least 18 fatalities and dozens of injuries, with rescue teams deployed to the hardest‑hit villages.

The verification team combined footage posted on social media with satellite imagery and on‑the‑ground recordings supplied by journalists and residents, applying geolocation and timestamp analysis to confirm the sequence of events. By aligning the visual evidence with official hydrological data, BBC Verify was able to trace the flood’s progression from its source near the Langtang glacier, through the Arun River basin, and into the Yarlung Tsangpo watershed. The comprehensive reconstruction underscores the role of rigorous video verification in documenting natural disasters and aiding humanitarian response efforts.