Mount Tambuyukon or Tamboyukon (, Dusun: Nulu Tambuyukon) is a mountain located at the West Coast and Kudat divisions of Sabah, Malaysia (located on the tripoints of three districts namely Ranau, Kota Belud as well as Kota Marudu). It is considered the third-highest mountain in the country with height at 2579 m, lying north of the highest Mount Kinabalu.

Geology

The glaciated summit plateaus and Pleistocene glacial tills of the Kinabalu area including similar deposits near to Mount Tambuyukon indicate that the summits of Tambuyukon, Kinabalu and possibly Trusmadi were significantly higher than other parts of the Crocker Range by the Pleistocene. Together with Mount Kinabalu, it is part of the Wariu Formation.

Biodiversity

The mountain supports a wide range of unique flora and fauna, including a number of pitcher plant species of the genus Nepenthes. A mammal survey in 2012 and 2013 from 300 m to the summit, recorded the second known population of the summit rat, and a total of 44 mammal species.

Features

There are two climbing trails towards the mountain summit, one from Monggis village and the other from the Sabah Parks substation in the same village, both located in the Kota Marudu district with permission from the park authority needing to be obtained before the climbing. The mountain is considered one of Sabah's ecotourism destinations, albeit minorly.