La Jara is a region that is structured into two different areas according to its geomorphological characteristics: to the north lie sedimentary soils created by siliceous alluvia, terraced deposits and valleys, whereas to the south can be found strong Palaeozoic structures composed by quartzite with slate or sandstone Banks alternating with marl.

There is predominantly granite area whose morphology varies according to the composition of rocks. There are some crags near Aldeanueva de Barbarroya which constitute a particularly interesting landscape of granite boulders.