We left from the parking lot of Puerto de Navacerrada, elevation 1.812 m, and headed between the facilities of the Guarramillas chair lift taking the PRM-17 that takes us to where the Pipe Road begins. There we turn upwards to look for the cement track that goes up in La Bola del Mundo.
We arrived at the Alto de las Guarramillas at 2,257 m, also known as Bola del Mundo. Here we turn on the PR-M / SG-31 always above the dividing line between the Community of Madrid and Castilla y León. Halfway down, at Circo de las Guarramillas, you want to turn towards the Winter Station of Puerto de Navacerrada with the intention of returning to the starting point. But the risks and the accumulated ice make us reconsider the route and we change it in Cotos direction.
We follow the descent of the PR-31 through the Loma del Noruego, passing through the Peña del Águila, the Altozano where there is a water deposit and finally we descend to Cotos to return to the Puerto de Navacerrada with the Nature Train. But while we wait, we make a quick and good meal in La Cantina de Cotos.
Good route, lots of plates of icy snow.
Max elevation: 2191 m
Total climbing: 767 m
Total time: 03:27:30