News: A barrier lake formed near the Nepal–Tibet border after a glacier-related collapse blocked the Chhochen–Purepu Tsangpo river confluence.

What is a Barrier Lake?

• Forms when landslide debris blocks a river/stream.
• Triggers → earthquakes, heavy rainfall, glacier-related collapse.
• Water accumulates behind the natural barrier → sudden breach can cause Landslide Lake Outburst Flood (LLOF).

Why is LLOF Dangerous?

• Sudden release → huge volume of water + rocks + debris + sediment downstream.
• Can trigger secondary landslides and severe flooding.
• Breach timing is difficult to predict → may occur within days or after decades.
• 1786 Sichuan, China: One of the worst recorded LLOFs, triggered by an earthquake-induced landslide.