千山万壑

Explanation: Sink: ravine. Rolling hills, high and low overlap. 　　Usage: Joint type; as subject, object; describe the rugged 　　Source: Southern Song Liu Yiqing, "Shi": "Gu Changkang from Hueiji also, the beauty of the mountains asked. Gu Yun: 'Qian Yan King show, myriad Rapids, vegetation kept the cage on it, Ruoyun Xing Wei Xia.'" Thesaurus:  peaks over peaks, peaks rising one upon another, Chibaya TIMES, TIMES Chibaya, long trip