Mashan Observation Station — Located in Jinsha Township, Mashan is only 2,100 meters away from Jiuguang on the opposite shore, and as little as 1,800 meters during low tide, making it the closest point between Kinmen and Xiamen.

Mashan Observation Station. Located in Jinsha Township, Mashan is only 2,100 meters away from Jiuguang on the opposite shore, and as little as 1,800 meters during low tide, making it the closest point between Kinmen and Xiamen. Located in Jinsha Township, Mashan is only 2,100 meters away from Jiugong on the opposite shore, and the distance is reduced to 1,800 meters at low tide, making it the closest point between Kinmen and Xiamen, and was a key military outpost for observing maritime activities on the opposite shore in the past, known as the "First Line of Defense under Heaven". Address: 金門縣金沙鎮光華路二段馬山觀測所 Hours: 00:00–23:59 Kinmen