BBC Verify has meticulously mapped the course of the recent devastating flash flood that impacted Nepal and Tibet. The investigation utilized and verified numerous videos circulating online to reconstruct the disaster's trajectory. This analysis allows for a clearer understanding of the flood’s origin and the extent of the damage caused along its path. The findings pinpoint the initial breach of a glacial lake as a likely trigger for the catastrophic event. The research offers crucial insight into the event, aiding in future risk assessment and disaster preparedness efforts in the region. This mapping process demonstrates the power of open-source investigation in documenting and understanding large-scale environmental disasters. The verified visual evidence provides a compelling account of the flood’s destructive power.