Summer pastures, sacred lakes and a moving glacier
Gokyo was a yersa, a summer settlement, where Sherpa families from villages lower in the valley brought their yaks and nak to graze in the monsoon months. Stone huts stood empty for half the year. Lodges came with trekkers from the 1980s, and some Gokyo families now live here through the trekking seasons, moving down in winter when the lakes freeze and the trail fills with snow.
The lakes form a chain of six main bodies of water fed by the Ngozumpa glacier's seepage and meltwater, lying at roughly 4,700 to 5,000 m. In 2007 the Gokyo and associated lakes were designated a Ramsar site, a wetland of international importance, covering about 7,770 hectares. They are sacred: Buddhist prayer flags ring the shore, and Hindu pilgrims come to bathe at the festival of Janai Purnima in August.
Beside them the Ngozumpa glacier, about 36 km long and often described as the longest in Nepal, flows south from Cho Oyu. Its surface is buried in rock and dotted with meltwater ponds, which scientists have watched grow as the glacier thins. Trekkers crossing towards the Cho La walk over it on a path that shifts each year as the ice moves.
