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The Liouguei Tunnel is located in the eighteen Arhats Mountain in Liouguei District. The tunnel opened in 1937, and was built to solve the transportation problems created by the large number of camphor trees in the area, which were being harvested to produce camphor oil. The local people used to call it the "Six Caves." The tunnel was largely disused after the outer ring road opened in 1992. However, after the 2009 Morakot disaster caused widespread damage to southern Taiwan, flooding and landslides made the outer ring road impassable. During this time, rescue vehicles used the abandoned Liouguei Tunnel until the outer ring road was repaired. The tunnel is now part of the Liouguei 'Eighteen Arhats Mountain Nature Reserve.' In order to visit, tourists need to apply at the Pingtung Forest District Office in advance. A one-hour stop is suggested. Professional guided tours are available to help visitors appreciate the local cultural heritage.