Tongtianyan is located in Shijiaotou Mountain, 3 kilometers southwest of Yingde City. It is a large limestone cave. For more than a thousand years, Tongtianyan has attracted tourists to visit with its majestic, shocking landscape, strange and magnificent shape, and unique cultural connotation. It is a rare tourist attraction in Yingde and even Lingnan. The Tongtian Cave has a total area of more than 6,600 square meters. It is divided into four halls from small to large and connected by a magical stone forest corridor. Each hall has its own characteristics. The stone bells, stalagmites, and stone curtains in the halls have different shapes and changes, which are extremely magical.