The trail system is divided into four stacked loops: The Short Loop, Long Loop, Outer Limits, and Area 51. Black Hole is a short, optional add-on found just off the Short Loop. The route mapped here is the Long Loop, which is a scenic yet mostly-flat dose of the best singletrack that Alien Run has to offer.

On this fantastic loop run, you'll enjoy a delicious taste of the best singletrack that Alien Run has to offer! The singletrack on this loop is well-ridden, creating a smooth, flowing trail that dips and bobs through the junipers, intermittently running over exposed slickrock slabs and along elevated rock rims. Throughout the run, you'll enjoy ever-changing scenery in this beautiful Northern New Mexico desert... just try to ignore the constant hum of the oil wells.

This relatively mellow run does have a few rocks, sandy bits, and washes to negotiate, but all of the footing is quite solid, and it's fairly easy to overcome any potential obstacles. If even this "Long Loop" doesn't offer enough mileage and you're considering heading out to Outer Reaches and Area 51, do note that the trail character changes dramatically. The trail gets much steeper and rougher, and the trail tread contains many loose rolling rocks that make for tricky footing.