Hou'er Sinkhole Scenic Area is located in central Kaiyang County. The name "Hou'er", which means monkey ear in Chinese, came from its shape for the resemblance. The scenic area enjoys a combination of a sinkhole, steep cliffs, underground rivers and hanging waterfalls, featuring marvelous, steep, mysterious and secluded views. Due to its outstanding size and depth, and the fantastic shape, Hou'er Sinkhole is regarded as a local geological wonder. The picturesque setting and unique views have made it an ideal place for recreation and leisure.