The water of Namtso Lake is crystal-clear blue. Clear skies join its surface in the distance, creating an integrated, scenic vista. (Xinhua/Shi Haoyi)

Namtso Lake, known as the "heavenly lake" among the Tibetan locals, is the highest altitude saltwater lake in the world. The lake lies at an elevation of 4,718 m (15,479 ft). It's becoming popular for people from all over China to walk around the lake to appreciate its touching beauty. A hiking event is held annually during the Shoton Festival in early September.

People at the starting point ready for hiking. (Xinhua/Shi Haoyi)

The whole hiking mileage is 10.2 kilometers. Special activities are set for participants to experience the Tibetan folk customs along the way.

A hiker walks along Namtso Lake. (Xinhua/Shi Haoyi)

2.5 kilometers and 6 kilometers away from the starting point, rest stops provide special handmade tsampa, fueling energy for hikers.

People walk around the lake decorated with prayer flags. (Xinhua/Shi Haoyi)

Tsampa is a Tibetan foodstuff. It is made by flour, mixed with the salty Tibetan butter tea. Local herdsmen also teach hikers to make butter tea by themselves.

A woman is making tsampa at the rest stop. (Xinhua/Shi Haoyi)

At the rest stops, native Tibetan perform Wordo casting and weaving yak wool for hikers.

A man is performing Wordo casting. (Xinhua/Shi Haoyi)

Hikers who finish the travel can get special awards--white Hada, which means respect in Tibetan ritual.

A woman is weaving the yak wool. (Xinhua/Shi Haoyi)