Satellite Imagery Reveals Severe Flooding Along Nepal-India Border Rivers

Heavy rainfall in late September caused the Gandak River in Nepal and India to reach record levels, breaching embankments and inundating farmland across hundreds of kilometers. NASA's MODIS satellites documented the dramatic transformation of the river system between September 20 and 29, showing the extent of water overflow from the braided channel. The disaster displaced thousands of residents and affected hundreds of villages across the region.

The Gandak River, which flows through the border region separating Nepal and India, experienced catastrophic overflow in late September 2026 following sustained heavy rainfall across Nepal's western provinces. Satellite data from NASA's Earth-observing instruments documented a dramatic transformation of the river system over nine days, with water spreading far beyond its normal channel boundaries and submerging both agricultural areas and residential zones across hundreds of kilometers.

The flooding set multiple historical records, with measurement stations reporting water levels unseen since systematic monitoring began decades earlier. Beyond the immediate inundation of low-lying seasonal farmland in the river's natural floodplain, the overflow also breached protective embankments designed to contain such events, forcing thousands of residents to evacuate and affecting infrastructure across numerous villages in both countries.