Why does Nepal suffer severe monsoon flooding and landslides?

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1. 1

   Geography of Nepal (Wikipedia)

   WikipediaPublished Sep 30, 2026Checked Oct 11, 2026

   “Nepal measures about 880 kilometres (547 mi) along its Himalayan axis by 150 to 250 kilometres (93 to 155 mi) across. It has an area of 147,516 km2 (56,956 mi2). Nepal is landlocked by China's Tibet Autonomous Region to the north and India on the other three sides. West Bengal's narrow Siliguri Corridor separates Nepal from Bangladesh. To the east are Bhutan and India. Nepal has a very high degree of geographic diversity and can be divided into three main regions: Terai, Hilly, and Himal. The Terai region, covering 17% of Nepal's area, is a lowland region with some hill ranges and is culturally more similar to parts of India. The Hilly region, encompassing 68% of the country's area, consists of mountainous terrain without snow and is inhabited by various indigenous ethnic groups. The Himal region, covering 15% of Nepal's area, contains snow and is home to several high mountain ranges, including Mount Everest, the world's highest peak. Nepal, with elevations ranging from less than 100 metres to over 8,000 metres, has eight climate zones from tropical to perpetual snow. The majority of the country's population resides in the tropical and subtropical climate zones.”

2. 2

   Monsoon (Wikipedia)

   WikipediaPublished Oct 10, 2026Checked Oct 11, 2026

   “A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation, but now used to describe seasonal changes in atmospheric circulation and precipitation associated with annual latitudinal oscillation of the Intertropical Convergence Zone, specifically between its limits to the north and south of the equator. Usually, the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is a dry phase. The term is also used to describe locally heavy but short-term rains. The major monsoon systems of the world consist of the West African, South Asian–Australian, North American, and South American monsoons. The term was first used in English in British India and neighbouring countries, referring to big seasonal winds blowing from the Bay of Bengal and Arabian Sea in the southwest that brought heavy rainfall to the area.”

3. 3

   Increased rainfall-runoff drives flood hazard intensification in Central Himalayan river systems.

   Scientific reports (Pink et al.)Published Dec 8, 2025Checked Oct 11, 2026

   “The Central Himalayan floodplain is one of the most flood-affected regions of the world, but we have limited knowledge of climate-change impacts on fluvial floods. Here, we provide the first large-ensemble, regional climate-change impact assessment of design floods for the Karnali River in Nepal and China, based on high-resolution modelling, considering climatic, hydrological and statistical uncertainties, needed for building local mitigation strategies. Our simulations project increases in the 1% annual exceedance probability flood magnitude of + 40% (P10/90: 33/48%) (medium-emissions) and + 79% (P10/90: 54/82%) (high-emissions) for 2060-2099, with rainfall-runoff contributing ≥ 90% of the additional flood water. We show that the uncertainty in the projections is linked to the relative differences between the magnitudes of the largest and more common events and argue that it is important to include both atmospheric only general circulation models and earth system Models in ensembles to capture the range of event and model uncertainty.”

4. 4

   Wealth and land-cover change govern landslide fatalities on world's mountains.

   Science advances (Fidan et al.)Published Apr 8, 2026Checked Oct 11, 2026

   “Even on steep terrain, anthropogenic disturbances may fundamentally modulate landslides. Most of our knowledge regarding landslide-human interaction is restricted to local models or regional heuristic assessments based on empirical evidence. In this study, we used land-use-land-cover change as a metric to explain human pressure as a preconditioning factor for fatal landslide occurrences to provide a global overview. We addressed countries' income levels, populations, exposure, and a dataset of ≈60 years of land-use-land-cover changes with mountainous landmasses to compare landslides and fatalities across 46 countries. Our statistical analyses show that land-use-land-cover changes have a substantially greater influence on the density of fatal landslides and landslide fatalities than physical factors such as topography and precipitation, especially in lower-income countries. We observed a marginal landslide impact when the land-use-land-cover change was low, regardless of the income class. Our results emphasize that effective land-use-land-cover planning is critical to decreasing landslide fatalities, especially in low- and lower-middle-income countries.”

5. 5

   Homes and bridges swept away as fresh floods hit Nepal

   BBC NewsPublished Oct 11, 2026Checked Oct 11, 2026

   “Nepal is still trying to recover from catastrophic floods that hit less than two months ago, leaving thousands dead and missing.”