The Sulak Canyon (Avar: Сулахъ кӏкIал, Russian: Сулакский каньон) is a steep-sided deepest canyon in Europe carved by the Sulak River in Dagestan, Russia.

[1] The Sulak Canyon is 53 kilometres (33 mi) long, and attains a depth of over a mile (1,920 meters or 6,300 feet).

[3] The canyon is the result of erosion which exposes one of the most complete geologic columns on the planet.

Within this natural site, sediments of the Cretaceous, Jurassic and Tertiary periods come to the surface, in each of which ancient fossils are found.

[4] Some endemic, rare and poorly studied plant species, such as, horned sainfoin, have survived on the territory of the canyon.