The Wall is, as the name implies, a wall of rock that runs along the east side of the main campground loop, separating it from the back loop. It's a fairly long and narrow formation that extends from just south of Outhouse Rock almost all the way to Chimney Rock. The majority of routes are found on the west face although there are a few lines on the northeast side.
Rock quality here varies from somewhat poor to great with most being decent. Routes here run 5.3 to 5.11+, with most being cracks or traditionally bolted (i.e. somewhat sporty) faces. Additionally, good bouldering can be found scattered about the base of the formation.
Descents generally requires nothing more than a quick scramble, and for that reason it's a popular spot to run up and enjoy an outrageous desert sunset if camping in the immediate vicinity.
Park in the day use lot or if you're lucky saunter over from your campsite via the paved loop road in Hidden Valley Campground - the approach is minimal.