Definition: To describe a very far place, or very far apart.
Source: Chen Xuling of the Southern Dynasties, "Books between Emperor Wu and the Lingnan Chieftains during his Prime Ministership": "The end of the world is far away, and the corners of the earth are far away. There is no reason for the conspiracy, but it is based on love." Song Dynasty. ·Volume 6 of Zhang Shinan's "Records of Traveling Officials": "Today's distant officials and those who serve in distant places are all called Tianya Haijiao."
Tianya Haijiao is also a famous seaside scenic tourist area in Sanya City, Hainan Province. 24 kilometers west of downtown Sanya.