On the slopes West of the peak cebollera, There is a dehesa boyal which keeps one of the botanical relics that still remain in the region of glacial times. He is considered one of the most beautiful forests of the community of Madrid, Since its huge variety: Holly, Robles, Cherry trees, Hazel, Serval and, especially Birch, make this a spectacular place, more if possible when it comes the autumn and the contrasts between the different species are more patents.

The route starts next to the sewage station (Sewage treatment plant) of Somosierra. We crossed the old n-I and we incorporate to a road after crossing a portillo. The road ascends and is divided into three, We take in the middle of, the road between cambronos and hazel trees leads to the Meadow Brook. We crossed the brook, in this area we already see the first birch trees, along with Hazel, Oak and Holly.

The road ends at a track that we have incorporated, to the left (Northwest). The road leads us to the Fuentefría. Near this we see a birch with horizontal trunk. The road now, a little blurred, down to a pretty viewpoint, showing us a magnificent panoramic view of la Dehesa. We return to go to the source, and this time we are heading towards the left, looking for Brook, to cross it and go down right. The road is invisible, We follow the River until it reappears, and we add to it until you reach the junction of the home.