The crossing, between the walls

A steep-walled gorge with a river fording between the walls, the rock slick with wet.
The limestone is cut by rivers into narrow, steep-sided gorges. The floor is boulders and fast water, the rock wet and slick.
The flight from the strangers runs here, and Tebo's foot slips on the wet stone. The fall that breaks the leg, and starts everything, happens in the gorge.