From the first top, you can ride north for miles and miles along the tops and in the valleys and up and down long slopes. Most of the track is 4x4, but there is some random ST to be found too, mostly made by cattle and some foot traffic. This is not the prettiest country in Mongolia, but it loses it's snow early in the season, so it is a good place to get some miles in early. The estimate of 50km is just a ballpark figure. And from Dari-Ekh and Dambadarjaa you can access days and days worth of riding in the west end of the Hentii Mountains.