Sianok canyon is a steep valley (canyon) located on the border of Bukittinggi city, in District IV Koto, Agam regency, West Sumatra. The valley extends and curves as the city line from the southern Koto Gadang gorge to the Sianok Anam Suku village, and ends in the sub-district of Palupuh. Sianok gorge has a very beautiful scenery and also become one of the mainstay tourist attractions of the province.

The canyon Sianok, which is about 100 m deep, stretches along 15 km wide by about 200 m, and is part of the fault that separates the island of Sumatra into two longitudinal parts (Semangko fault). This fracture forms a steep wall, even perpendicular and forms a green valley-the result of the earth's descending (sinklinal) motion-which the Sianok Batang (rod means river, in Minangkabau language) whose water is clear. In Dutch colonial times, this chasm is also called karbouwengat or buffalo sanget, because of the many wild buffalo that live freely at the base of this canyon.

Batang Sianok can now be diarungi by using a canoe and kayak which is favored by a water sports organization "Qurays". The route taken is from nagari Lambah to jorong Sitingkai nagari Palupuh for approximately 3.5 hours. On the edge there are still many rare plants such as rafflesia and medicinal plants. Fauna encountered such as long-tailed monkeys, gibbons, hoops, deer, wild pigs, leopards, and also tapirs.