Vikos Gorge

The Vikos Gorge or Vikos Canyon (Greek: Φαράγγι του Βίκου) is a gorge in the Pindus Mountains of northwestern Greece. It lies on the southern slopes of Mount Tymphe with a length of about 32 km, depth ranging from 120 to 1350 m, and a width ranging from 2500 m to only a few meters at its narrowest part. Vikos is listed as the world's "deepest relative to its width" gorge by the Guinness Book of Records among others.

Source: Wikipedia (CC BY-SA 4.0) — https://en.wikipedia.org/wiki/Vikos_Gorge