Located in Poxin village, Hechi, Guangxi Zhuang autonomous region, the Fengshan Sanmenhai Scenic Area is the source of the Bama Panyang River basin and exhibits a typical karst landscape.

Fengshan Sanmenhai Scenic Area is hailed as both "Window to the World" and "Museum of Karst Geology" due to its spectacular scenery that integrates mountains, waters, caves, and sky, as it is comprised of seven closely connected collapsed sinkholes partly intertwined with an underground river.

In addition, it is well known as a "natural oxygen bar," with an anion content of more than 10,000 per square centimeter. The rich harmful ion content provides visitors with a high-quality natural environment and pleasant air, offering a refreshing atmosphere.