Aiyu Mountain Forest Road 阿玉山林道, Xikeng Forest Road 西坑林道. Tonghou Forest Road 桶後林道 and the Neidong Forest Road 內洞林道 were all developed to facilitate extraction of timber. The purpose of these roads changed in 1982 with the government ban on logging and the roads became paths for tourists, hikers, hunters and mountain rats the length of their memorial of forest destruction.
The valley opens up where many stream come together. Work has been done here, including building dams to manage the water flow, but mst of this work and the road have been destroyed. Their marks of landslides here. Passing through the open area, we follow the largest contributing stream back up into the forest into a beautiful canyon.
Neidong Forest Road 內洞林道 starts behind Xiaoyi Police station 孝義派出所 (formerly 烏玉檢查所 Wu-ai Police Station) on Tonghou Forest Road 桶後林道 east of Wulai 烏來. The road has a cement surface until 3.4km. A path from Laka village comes up at 4.5 km onto the forest road. At 4.7 km there is a usually open gate near the trail head to Lapu mountain. There is a path down to upper cable car station at 7.45k. There are major landslides at about 11 km. At the 12.3 km mark on the 15.8 km long Neidong Forest Road 內洞林道 the trail from Wawagu and Neidong Falls tourist area 內洞國家森林遊樂區 comes up to the road.
