Lake · China
Nam Co
Nam Co is a large salt lake high on the Tibetan Plateau in China, 4 718 metres above sea level. Its Mongolian name, Tengri Nor, means 'Heavenly Lake'.


Picture credit: justin73 (CC0) · 钉钉 (CC BY-SA 4.0) · Wikimedia Commons
Where is Nam Co?
Countries on its shores: China.
Middle of the lake: 30.69° N, 90.44° E
The story behind it
Nam Co lies at the northern foot of the Nyenchen Tanglha mountains, in the Tibet Autonomous Region of China. It stretches about 70 km from east to west and 30 km from north to south. Among China's salt lakes, only Qinghai Lake is bigger. No river flows out of Nam Co: water from snow and springs runs in and stays there. The deepest spot is 125 metres, and about half of the lake is more than 90 metres deep. Winters are bitterly cold, down to −40 °C. In December the whole lake freezes, and ice up to 30 cm thick stays until March. Five small islands without people rise from the water, and a peninsula called Tashi Dor reaches into the lake. For centuries, Tibetan pilgrims have visited caves on its shores. Long ago, in the Ice Age, Nam Co and Siling Co were joined in one giant lake.
Find it on the globe
Nam Co is there as a small blue dot with its name, right on the water. From far away the planet is only a blue ball; detail arrives as you zoom in, and this one appears once you are close enough. Open it on the globe.
It sits at its real coordinates, not near them — the same numbers listed in the facts above. Switch off the layer for this kind of place and it disappears again; the buttons for that are down the right-hand edge.
Questions children ask
How big is Nam Co?
Nam Co covers about 1 920 km², but sources differ and some give almost 1 970 km², because the size of the lake changes. It is about 70 km long and 30 km wide.
Why is Nam Co salty?
No river flows out of the lake, so the water can only leave by evaporating. The salt stays behind in the lake.
Does Nam Co freeze in winter?
Yes. In December the whole lake freezes, and the ice, up to 30 cm thick, lasts until March.
Where these numbers come from
Every figure on this page was checked against public reference sources before publication. Where sources genuinely disagree, the text says so.
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