Hordes of four-wheel-drive enthusiasts, and their respective four-wheel-driving monsters, have descended — or rather off-roaded — into the red rocks of Moab, Colo., for the 39th annual Jeep Safari.

The event began with a few Jeep drivers looking for a good time and has become an event complete with vendors, parades, and, of course, a whole lot of four-wheelin’ fun. Some 20,000 to 30,000 off-roadies were in Moab this weekend, part of the week-long festivities that now overshadow mountain-biking and marathon-running weekends in terms of financial boons for the red rock area. No word yet on how the rocks feel about it.