Located in Dongli village of Sanhe town, 16km of southwest of Lipu county, the name is derived from the Fengyu fish living in underground rive in cave. This cave runs through nine mountains with 5. 3km long totally. The small halls and big halls joint each other in cave, in which the biggest one is 25, 500 square meter, and an underground river of 2. 5km is suitable for boating. It is a rare majestic cave at home and abroad. Fengyu cave is composed of the following four parts.