‧Place of orgin ：North foot of Nanhuda Mountain (altitude 3,536M)
‧Length of Stream ：73 kilometers
‧Basin area ： 978 square kilometers
‧Main tributaries ：Yilan River, Lo-Dong River, Dahu River, Dajiao River, Siaojiao River, and Wushih River
‧Administrative districts passed through ： Yilan County:Da-Tong Township, San-shin Township, Yuan-Shan Township, Dong-Shan Township, Lo-Dong Town, Yilan City, Chuang-Wei Township, and Wu-Chieh Township.