Longmenyu, located in Sanzhuang Town, Donggang District, Rizhao City, 40 kilometers from Rizhao Seaside, is a national AAAA-level scenic spot, provincial water conservancy scenic spot, four-star Ping'an scenic spot in the city, municipal forest park, Shandong tourism integrity demonstration unit. The dome is 416 meters above sea level and has the reputation of "Shandong Seaside First".