On the ridges of the Central Cordillera, the Chilai and Nengao Antonjun Sectors have 49km of trails that require about 9 to 12 days to traverse. These trails are part of the National Trail System.
The trip to the Chilai South or Nengao North is considered to be of low difficulty for average people. The trip along the Chilai Peaks is of medium difficulty and the trip along Nengao Antonjun is more difficult. The entire trail is of high difficulty for most people.
The trail that goes through the Chilai Peaks and the Nengao Antonjun Peaks is some 49km in length. The Chilai Peaks include the Chilai North Peak (3,605m), the Chilai Main Mountain (3,559m) and the Chilai South Peak (3,357m) among hundreds of other mountains. The Chilai Peaks are known for their steep cliffs and the Kaluolou Mountain in the South Ridge is where the renowned Chilai Great Cliff is found. The ever-changing weather has earned it the name "the Black Chilai." The peaks in the north are ranked among the top 10 Steep Mountains in Taiwan. Six main peaks form the Nengao Peaks, stretching from north to south, they are the Nengao North Peak (3,183m), Nengao Mountain (3,262m), Nengao South Peak (3,349m), Guantou Mountain (3,060m), Baishih Mountain (3,110m) and Antonjun Mountain (3,068m). Along the Nengao Antonjun Mountain, one finds the most beautiful plateau prairie and high-mountain lakes (such as Wanli Lake, Baishi Lake and Tunlu Lake). Together with Jade Mountain and Snow Mountain, Nengao Mountain is known as one of the 3 highest mountains in Taiwan.
The trail that is located between 2,000m~3,600m above sea level is rich in plants that do well in various elevations, ranging from frigid ecosystems, to coniferous ecosystems to broad-leafed ecosystems of the mixed type. Common plantation species are bamboo groups, round-shaped pines on Jade Mountain, high mountain azalea, Taiwanese cold firs and Taiwanese hemlock spruce, cypress, Japan cypress, white cedar, Japanese cypress and camphor trees. Fauna resources are munt-jac, 、wild boar, water deer, goats, squirrels, flying squirrels, white-faced flying squirrels, Taiwanese monkeys and South Chinese weasels.