Covering an area of 22.40 km2 (8.65 sq mi), it is bordered to the north by Lozoyuela-Navas-Sieteiglesias, to the east by El Berrueco, to the south by Cabanillas de la Sierra and Torrelaguna, and to the east by Valdemanco.

European route E-05 runs through the town, following the old N-I radial road connecting Madrid to Irun and France (later split into the A-1).

The town is situated in the easternmost part of the range at about 1,038 m (3,406 ft) above sea level.

Although most of the mountain range is in La Cabrera, it also reaches the neighbouring municipalities of Valdemanco and Lozoyuela.

Its main features include the summits of Cancho Gordo (1,564 m [5,131 ft]), Pico del Miel (1,392 m [4,567 ft]) and Cerro de La Cabeza (1,247 m [4,091 ft]), as well as natural springs and streams, including the Alfrecho stream which feeds the Jarama River.