The Tianlong Trail starts at Tianlong Suspension Bridge at 186K of the Southern Cross-island Highway and ends at 197.2K of the same Highway, with a total length of 1.089 kilometers. It is a shortcut between Lidao and Wulu. In the 4th year of Showa (1929), the Japanese built the section of the Guanshan Historic Trail from Wulu through Lidao to Halibsong, and erected a suspension bridge in the valley between Lidao and Wulu, named "Tianlong Bridge". After crossing the bridge on the Guanshan Historic Trail, it goes up steeply directly to Lidao, which is different from the current route of the Southern Corss-island Highway. After the war, the Tianlong Bridge was in disrepair and impassable. When the Southern Cross-island Highway was being built, it was refurbished in order to transport construction personnel and materials. By 1993, the Tianlong Bridge had become a dangerous bridge, and the historic trail on the other side of the bridge was also abandoned. The Haiduan Township Office then restored the suspension bridge and dug a stone-step trail on the mountain wall on the north side of the suspension bridge. This section of the trail is the Tianlong Trail.
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