Pangong Tso is a salt lake that freezes into a solid sheet every winter, even though its water runs saline. It stretches about 134 kilometres along the high desert of Ladakh at roughly 4,225 metres, a ribbon barely five kilometres wide and hemmed by bare, rust-coloured mountains. The lake has no outlet, so the meltwater feeding it slowly grows salty — though the eastern arm stays nearly fresh while the western end turns brackish. Its fame rests on colour: across a single day, as the sun swings and clouds drift past, the water runs from deep navy through electric blue to turquoise and green, and the shift against the scorched slopes looks almost unreal. The lake is split by a contested border, too — roughly half lies in Tibet under China, about 40 percent in Indian Ladakh, and a disputed stretch between them falls on the Line of Actual Control, where Indian and Chinese troops came to blows in 2020.
Reaching the shore is half the journey: the road from Leh climbs over a high glacier pass before dropping to a string of shoreline villages. In the thin air the water often lies dead still; prayer flags snap in the wind, yaks graze the gravel banks, and after dark, with no town for miles, the Milky Way arches over the lake. Most travellers sleep in tent camps on the shore so that they are there at dawn, when the first light comes down the mountains and the colour returns to the water. Indian cinema turned this shore into a pilgrimage — the closing scene of the 2009 film 3 Idiots was shot here — and crowds have grown every year since. Because it lies in a sensitive border zone every visitor needs a permit, and the lake is only reachable from about May to September; by November it is sealing over beneath a metre of ice.