Poison Spider Mesa forms one of the cliff features that is part of the Moab landscape northwest of town. The mesa is bordered on the east by Moab Valley and on the south by the Colorado River. Access is via Scenic Byway 279, the "Potash Road," and the trail climbs to the rim along with the sloping rock layers. The first few miles of trail must be retraced, but most of the travel time will be spent on a loop that reaches the rim. It has deservedly become of the most popular trails because it has great scenery. Incidentally, we love the name, but the population of Black Widows is probably no greater than other local areas. Approximate mileage: 37 total, 16 off highway.

The vista across the fins of Behind the Rocks toward the La Sal Mountains is as fine as they come. The rim view overlooks Moab 1,000 feet below and includes a panorama of about 300°. The usual lunch stop is just above so-called "Little Arch." Jeep Arch (about 3 miles away) is seen clearly from near the rim.

Much of the loop portion is on Navajo Sandstone slickrock, with one stretch of 0.4 miles of bare rock. There are also rock ledges, sandy washbottom, and two blow-sand hills.

After some switchbacks that traffic is making rougher and a fairly flat stretch, a sandy canyon leads to some switchbacks about 2 miles into the trail, this time with rock ledges that give it the higher rating. There are lot's of steep slickrock climbs.