One section between Liudu and Bai-Hsi-Hou Hsi Trail is a risk canal of a boundary between Tai-an Village and Liudu Village, so it is called Liudu Xianjun Trail. The length of Liudu Xianjun Trail is about 350 meters. The view of the risk canal is all-natural. The meandering Keelung watercourse seems like Jiuqu River of Wuyi Mountain of China. Therefore, it is also called small Wuyi Mountain. Besides, the below waters of Keelung River is called Gueitan because there are many tortoises. The ecology is various; the trail is made of timbers; the facilities are complete. The cliff of the boundary was carved the four Chinese words or “Liudu Xianjun”. Visitors not only can appreciate the landscape of the Keelung River but also realize the culture and history.