The Karap Valley was a depression on Hewl. It was characterized by its frequent fog banks.
The Filar-Nitzan spy Vacander, a gaseous being, could hide in the fog banks of the valley. While doing so, he found Rebel Colonel P. Essex Yerac chasing a group of bounty hunters. Vacander showed Yerac his red eyes, apparently coming from the fog itself, and ordered Yerac to keep distances.