At least 300,000 people across the Himalayas are now living directly in the path of potential disasters after a surge in construction across high-risk river valleys and glacier zones. According to a study published in Scientific Reports, the amount of built-up land in dangerous mountain areas across northern Nepal, south-eastern Tibet, and northern India expanded by 45 percent between 2016 and 2023. Near glacial lakes vulnerable to sudden outbursts, development surged even faster, rising by nearly 78 percent over the same period.
The rapid growth has been fuelled largely by tourism, infrastructure projects, and hydropower dams. Nine researchers from the UK, Nepal, and India analysed territory up to 50 kilometres downstream from Himalayan rivers, alongside approximately 1,360 glacial lakes. In tourist hubs like Pokhara, Nepal, hotels and settlements have spread right alongside riverbanks, with some older structures standing barely five metres from the water despite recent regulations requiring safer buffer zones.
These crowded valleys face growing peril from climate change, as the Himalayan region is warming at twice the global average. Rising temperatures rapidly melt glaciers and permafrost, destabilising steep slopes and causing high-altitude rain where only snow once fell. When glacial lakes overfill, they can abruptly rupture, sending catastrophic walls of water and debris crashing into communities below.
The researchers caution that their findings represent only a fraction of the real danger, as the study examined a limited geographic zone. Lead author C Scott Watson, a glaciologist at the University of Leeds, warned that today's construction choices will dictate disaster risks for decades to come, leaving local populations to face life-threatening floods unless regional planning and early-warning systems improve quickly.