Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level. (Photos: Xinhua)

Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level.

Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level.

Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level.

Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level.

Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level.

Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level.

Aerial photo taken on Sept. 9, 2018 shows a view of Lake Manasarovar in Ngari, southwest China's Tibet Autonomous Region. The Ngari area has an average altitude of over 4,000 meters above sea level.