I include in this network all the tracks from the observatory south up the mountain and also any trails east of the Observatory all the way to the Chuluut Am (about 3 km to the east of the observatory). It's about a 10km square area. There are a lot of randomly connected trails here. It is a good mix of singletrack and old two track. Most of the trail is organic with good flow, along with various rocky or rooty technical areas. It requires some exploration.