Wang Xiaohua, head of the Chinese branch of the International Dark-Sky Association and a leader of the Ngari reserve program, said such areas were important for promoting astronomy.

Ngari is among the best sites for astronomical observation on earth, due to its high altitude and large number of cloudless days throughout the year.

However, the recent inflow of people from other areas has given rise to increasing urbanization, and thus the associated risk of more light pollution.

"If we do not take action now to preserve the area, we risk losing one of the best astronomical sites on earth," said Wang at the news briefing.

The foundation has also signed an agreement with authorities in Tibet's Nagchu prefecture to establish a night sky park, which will feature limited lighting facilities and a special area for astronomical observation.