This massive rock parapet is currently the boundary of the The Hell of Boiling Blood. The rock wall encircles the domain roughly 100 miles from Refinery City.
The wall is twenty miles high and generally vertical expect for the last mile where it gently slopes inward to meet the rock ceiling. In place it is covered with scaffolds, ladders, rock paths hewn out of the rockface itself, all created by miers slowly chipping away at the low grade silver ore the rock wall consists of.
The rock is also riddled with tunnels and caves, some created by miners pursuing the occasional seam of higher quality ore, others naturally occurring. Some of these tunnels actually lead to other planes of existence or other hells.