Source: Xinhua Net
This is the interior of Vientiane Cave taken on January 14. Located in Hanwang Town, Wudu District, Longnan City, Gansu Province, Wanxiang Cave is a large-scale natural cave in northwest China. According to geological experts, Vientiane Cave is a typical karst landform with a history of 250 million to 300 million years. Photo by Xinhua News Agency reporter Lang Bingbing