Puma Yumco (Tibetan: ཕུ་མ་གཡུ་མཚོ, Wylie: phu ma g.yu mtsho; simplified Chinese: 普莫雍错; traditional Chinese: 普莫雍錯; pinyin: Pǔmò Yōngcuò) is a lake located at 5,030 m (16,500 ft) above mean sea level on the southern Tibetan Plateau, and is situated within Nagarzê County of the Tibet Autonomous Region.

Puma Yum literally means The Blue Jewel which is floating in the sky.

Since the climate is warming, the ice is becoming thinner and thus creates a problem for the 120 people living off and around the lake.

Water in such lakes tends to be blue to blue-green and to have high clarity due to low levels of photosynthesizing organisms such as phytoplankton.

During the winter, the lake develops intricate ice block patterns on the surface, ranging from less than ten to hundreds of metres in diameter.