The Grandest Canyon
Situated throughout most of the Blasted Plains, the Grandest Canyon is an enormous and near-bottomless gouge in the earth. Created during The Fold by some unknown battle, the Grandest Canyon dominates much of the landscape. The canyon reaches down to the magma layer of the Flattened Sphere throughout most of its length, with some of the deeper sections of the trench reaching so deeply the sky can be seen on the other side of the world. These gaps in the world are used for a variety of purposes ranging from power generation and exploration, to recreational canyon diving.
Several cities exist across the canyon, built into its walls, hanging between the two sides via chains or immense bridges, or simply along its edges.