Location: Guizhou, Guangxi, Yunnan and Chongqing in southwestern ChinaWhy it's incredible: China's enormous sinkholes make the landscape look like someone has taken a hole punch to it.
China's tiankeng are unique, according to Zhu Xuewen, a researcher at the Institute of Karst Geology at the Chinese Academy of Geological Sciences. China is home to around 200 tiankeng, which are mostly distributed from the central Shaanxi province down to the Guangxi Zhuang autonomous region in the southwest. Roughly one-third of the country consists of karst — the highest proportion of overall surface area of any country in the world — compared with just under one-fifth in the United States.
By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.Despite their size, China's tiankeng can be hard to spot among the jagged mountains and lush forests that cover much of the southwestern part of the country. That's why dozens of them have only been discovered in recent years.