Point of departure: Houses of the pontoon of la Oliva. To be a great travel route, We can set the start in any of the villages or nodes through which.

Designed as a variant of the GR-10, the GR-88 crosses the area east of the Sierra, from North to South, starting at the pontoon in la Oliva, out of the Sierra Norte de Madrid after crossing the Jarama River, bygone La Hiruela, and plunging into the province of Guadalajara.

The route runs through practically all the Sierra of Puebla. In their home borders the meanders that draws the Lozoya after passing through the dam of La Parra, This area shows a nice riparian forest along with hydraulic constructions of the Canal de Isabel II. After passing the town of El Atazar road gains altitude up to the Hill of the Pinillas, where we get into one of the most isolated areas of the reserve of the biosphere of the Sierra del Rincón, the Valley of La Puebla. After passing through the mountain town of La Puebla de la Sierra, the path climbs to the peak of the Porrejón one of the best vantage points to see the Sierra del Rincón and the Sierra de Ayllón. More down because we see La Hiruela, example of mountain architecture, and passed this town, We continue down an oak forest to the Jarama River, the road back to gain altitude to the town of El Cardoso de la Sierra (Guadalajara).