Hapen Trail connects New Taipei City and Yilan. It runs along Nanshi River, leads to the Wumen Creek and Hapen Creek up the river and ends at the spot where Wumen Creek meets the Nanshi River. It is about 14km to go back and forth and takes 6~7 hours. The Nanshi River is below the trail. Along the trail, broadleaf trees, bird’s nest ferns and shoestring ferns interweave into a subtropical forest. At the end of the trail, the ruins of the police patrol road can still be seen.