The Gou loophole is located in the Beiliugou loophole scenic spot of Yulin City, 3 kilometers east of Beiliu City City. It covers an area of 204 hectares and is a provincial scenic spot. It consists of five caves of Baogui, Yuqi, Baisha, Taoyuan and Yujin, and has a total length of more than 1,500 meters.