One River, Two Names, Two Countries: Why the Khawthlangtuipui Flood Matters Beyond Lunglei

Article summary

More than 80 families were evacuated in Mizoram's Lunglei district in July 2026 after the Khawthlangtuipui river overflowed following a week of continuous heavy rain — 42 families in Tlabung town, where houses were fully or partially submerged, and around 40 more from Tipperaghat village in the Tlabung sub-division. Landslides, rockfalls and related incidents were reported from more than 29 locations across the state, and the Aizawl–Thenzawl–Lunglei highway was blocked by major rockfalls at Ngaizel on Aizawl's southern outskirts. The river matters well beyond the evacuation figures. Rising in the Lushai Hills of Mizoram, it crosses into Bangladesh where it is known as the Karnaphuli, runs roughly 270 kilometres through the Chittagong Hill Tracts and empties into the Bay of Bengal near Chittagong. It carries the Kaptai Dam, Bangladesh's largest hydroelectric project, whose reservoir — Kaptai Lake, the country's largest artificial lake — submerged around 54,000 acres on completion in 1962, displacing roughly 100,000 people, about 70 per cent of them Chakma, and driving more than 40,000 across the border into India. A local flood on this river therefore sits on top of one of South Asia's most consequential displacement histories.