This 18km national trail (福巴越嶺古道; Fú-bā Yuèlǐng Gǔdào) begins south of Wulai just before Fushan village. As the crow flies, Fushan isn't far from Wulai, but the landscape takes a noticeable turn to the wild along the road here as the Nanshih River valley narrows, and the sandstone cliffs drip with dark vegetation. Landslides are very common in this area and Fushan can be largely cut off from the rest of Taiwan for months at a time.

The name of the trail comes from the two villages connected by it: Fushan and Upper Baling on the North Cross-Island Hwy. Two hundred years ago the Atayal hacked the route up the mountains to facilitate trade and marriage (the trail is known as the Marriage Trail). Today it is still common to see Atayal hunting or fishing in the area.

Beginning in a dense broadleaf jungle, the trail ascends through forests of fir, beech and crepe myrtle to the mist-shrouded stands of ancient red cypress at Lalashan (2000m). Walking up takes about eight to 10 hours. It's possible to camp out on the trail or even call a B&B in Upper Baling (just down from Lalashan) to pick you up in Lalashan; you'll need to arrange this beforehand. The next day you can either hike back to Fushan or catch a bus in Upper Baling north to Taoyuan.

Note that on the way from Wulai to Fushan you need to stop and register at a police checkpoint. Bring your passport or Alien Resident Certificate (ARC).