Recently, more than 1,000 sheep from Tuiwa Village, Nakartse County, Shannan City, the Xizang Autonomous Region passed through the Puma Yumco Lake to the island in the middle of the lake.

It has been reported that with an average altitude of about 5,070 meters, Tuiwa Village, located in Nakartse County, is the administrative village with the highest altitude in the world. People here are mainly engaged in animal husbandry. Because of the high altitude and short summer in the village, the meadow cannot provide sufficient winter feed for the sheep. Therefore, in the coldest time every year, when Puma Yumco Lake freezes into a giant blue mirror, villagers nearby Tuiwa Village in Nakartse County would herd thousands of sheep across the iced lake surface to find better forage on the mid-lake islands.