El Cavall Verd (“Green Horse”) or Serra del Penyó is located in La Vall de Laguar and delimits the southern part of the municipal area, serving as a dividing line for the rivers Xaló-Gorgos and Girona. Likewise, it constitutes the limit of the municipalities of Murla and Benigembla, above which is the sunny side of the mountain range.

Formed by limestone rocks and Cretaceous marls from the Senonian period, it reaches 826 metres in La Perereta (crowned with a cross) and 843 metres in La Penya de L'Alt. In El Pla dels Avencs there is a karst area rich in caves and chasms.

Els Penyals de Laguar, famous for being the scene of the last battle before the Moorish expulsion of 1609 and currently graphic symbols of the valley, reach an altitude of 789 metres above sea level.

The Moorish legend said that the mountain range was sunken because, centuries before, fighting against the army of King Jaume I, a giant and powerful warrior called Alfatami had fallen there with his green horse, leaving both of them buried. When necessary, there would be a resurrection of the warrior and steed so as to defend the Moors from the Christians if they dared to invade the valley again.

In the part of the mountain range that belongs to La Vall de Laguar there are many springs and fountains, and its waters end up in numerous ravines that cross it transversely.

On the south-facing slope and the westernmost sector of the range lies the ravine called Barranc de Moragues, along with the spring of La Mata and the ravine of Les Carrasques, where there is the spring of the same name. The two ravines reach the River Xaló, near the road that goes from Benigembla to Castell de Castells.

On the shady slope, in the central and eastern areas of the mountain range, is the ravine known as Barranc dels Olbis, with a spring of the same name. There are also the ravines of Font Figuera, Can Torres and La Font Grossa, the latter next to Fleix. Finally, the ravine of Les Hortes, which carries the waters of the springs called Font del Gel and Fonts de Campell, is also near to this village. All these ravines in the central part pour their waters into the River Girona. In the lower part of the mountain slope are significant areas for cherry cultivation, with optimal conditions of humidity and altitude.