This is a system of four main ridges coming off the north side of Bogd Khan Uul (mountain). These ridges are big and steep in many places, and thus, the name "The Beast" -- given by another rider. Plus, from afar, the four ridges look like the four legs of a massive beast. Though big and steep, these ridges are not as big or steep as others on Bogd Uul, and the trails sometimes take a better line along the contours than other trails on the mountain. So these ridges and their side slopes are much more rideable, but there are still some long hike-a-bike sections going up. The trails are mostly loose over hardpack, but there are also areas of organic dirt (in the forested valleys) and grass. There is some gnar here and there, mostly on the ridges. Some of it is not too bad, but some ridges are quite technical. All in all, the descents are quite fast, except in the more technical sections.