Situated at the 128km mark on the Central Cross-Island Highway, Bilyu Sacred Tree is a Lunta Fir (Cunnhamia lanceolata var. konishii,). This tree is 3,200 years old and about 50m high with a diameter of 3.5m. Situated between Cih-en and Bilyu, Bilyu Sacred Tree is the largest old tree along the Central Cross-Island Highway.

Among Taiwan's native trees, the Lunta fir is the tallest. They can exceed more than 70 meters and can be used for reforestation.

Because the topography near Bilyu Sacred Tree is very complex., the temperature increases with altitude and it is often crowned with clouds and mist, various tree species are intermingled here. The highest layer of the forest is conifers such as Chinese spruce (Picea morrisonicola Hayata.), Taiwan hemlock [Tsuga chinensis (Franch.) Pritz. ex Diels var. formosana (Hayata) Li,] and Lunta fir. Below them are evergreen broadleaf species with some deciduous species mixed in.