Gurudongmar Lake sits at 5,430 metres, among the highest lakes on Earth, and it freezes almost solid from November to mid-May. One corner of it, by local belief, never ices over. Pilgrims hold that Guru Padmasambhava, passing through in the 8th century, touched the ice so that people here would always have water. The geology tells a slower story: this is a moraine-dammed glacial lake in the far north of Sikkim, barely five kilometres from the Tibetan border, fed by meltwater off the Kangchengyao massif above it. Its outflow drains into the Tso Lhamo basin and becomes one of the first sources of the Teesta, the river that runs down through Sikkim and Bengal into Bangladesh. Bare wind-scoured plateau and snow peaks ring the water, and there is not a tree in any direction. Under a sky that seems too close, the lake turns a hard, clear turquoise.
Getting there is the effort. The road climbs for hours from Lachen on rough unpaved switchbacks, gaining close to two vertical kilometres, and most people sleep a night at altitude first. By the top the trees have vanished, the air is thin, and headaches are normal. At the lake, prayer flags strung across stone cairns snap in a constant wind, and pilgrims step down to cup the blessed water in their hands. Sound almost disappears and colours sharpen. Access is tightly controlled: the lake is inside a restricted border zone, so foreign nationals are stopped at Thangu and cannot continue. Indian visitors need a Protected Area Permit arranged through a registered operator.