The most noteworthy of its mountain ranges comprises the sector of the Cantabrian Mountains forming its southern boundary, constituting the watershed between the basins of the Rivers Sella and Duero, home to peaks such as El Abedular (1,813 m), Les Pandes (1,879 m) and Ten Crag (2,142 m), among others. Ponga Ridge constitutes its western boundary, with noteworthy peaks such as Maciéndome (1,899 m) Tiatordos (1,951 m) and Campigüeños (1.838 m), among others.
The most important rivers in the borough are the River Sella, which runs through the eastern part of the territory to continue its course through Amieva, and the River Ponga, which runs from south to north through the borough. The local tributaries of the River Sella include Roabin Stream and the Rivers Mojizo, Porciles and Santa Bustia. The most important tributaries of the River Ponga are the Rivers Taranes and El Valle Moro. Most of these river valleys are narrow with sheer slopes, the most spectacular cases being those of Ponga Gorge and Beyos Gorge.
Ponga Nature Park boasts a broad range of environmental diversity, representative of the central-eastern mountains of Asturias, as well as very well conserved natural resources (geological, plant and animal).
From the geological point of view, the territory of Ponga Nature Park lies in the so-called "Ponga Unit", whose most prominent structural feature is the presence of a series of winding thrust faults resulting from the existence of folds lying perpendicular to them. There is also an important collection of faults that cut both sets of structures, some of them extending a considerable distance sideways, as occurs with the Ventaniella Fault which, due to the Alpine orogeny, has suffered a vertical displacement with elevation of the northeastern block, thus giving rise to Ponga Ridge.
