It is considered as the second highest mountain in both Sabah and Malaysia at 2,642 metres (8,668 ft),[1][2] after Mount Kinabalu with Trusmadi offering a tougher climbing challenge than the latter.

[3] The mountain geology comprises tertiary formation of mudstone, shale and argillite with subordinate beds of quartzite, sandstone, siltstone and limestone breccias.

[4] The mountain area is located within the Trusmadi Forest Reserve where it supports a wide range of unique flora and fauna, including Nepenthes macrophylla, a species of pitcher plant.

[5][6][7][8] The natural hybrid Nepenthes × trusmadiensis is named after the mountain.

[9][10] In 1999, a small-scale expedition on the mountain biodiversity was conducted through a collaboration between Sabah Museum and Louisiana State University Museum of Natural Science with various bird species are found within the area.