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 Short Loop, which is a scenic yet mostly-flat introduction to the Alien Run trails.

Even though this loop is short, you'll still 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. It's easy to extend this route to the "Long Loop" option, but heading beyond the Long Loop trail into the Outer Limits will make for a much more challenging endeavor.