Mataian River originates from the north of Danda Mountain and is one of the tributaries of Hualien River. After the Guanmen Historic Trail crosses the highest point in the eastern section of the Luntaiwen Mountain, it first descends along the ridge to the west saddle of Luntaiwen, then goes down around two big ravines, and then descends along the northwest ridge to the upper reaches of Matai’an River at an altitude of 1,800 meters. On the lower stream, there is a wide flat land, where the camp of Qing army was stationed. There are seven red cypress trees that are more than 15 meters tall and so it was called "Giant Tree Camp Site". The stream there is crystal-clear, knee-deep, and there are white boulders everywhere with lush forests on both sides of the stream, making it very peaceful.
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