Not a river canyon but an open wound in the earth, reaching the sea.

Made: c. 4,000 years before year zero (First Age), by Sylvanus (also called the Gorge of Doom).

Story

Sylvanus cracked the earth where the sky-stone had struck — at World’s Breach — into the Gorge of the Titans. It is an open wound that runs to the sea, so that the sea flows into its lower end and mingles at its foot.

Connections

Open: [?] nothing is recorded of it after Age I.