It is named after Saint Peter the apostle and rises in the limits of Cáceres and Badajoz Provinces, in the western part of the autonomous community of Extremadura close to its border with Portugal.

The Peña del Águila Dam on river Zapatón that supplies water to Alburquerque is located in the range.

The Sierra de San Pedro range is not very conspicuous and since the maximum altitudes rarely surpass 700 m, its main ridge barely rises above the surrounding high plateau in some stretches.

The highest point is 702 m high Torrico de San Pedro, other important summits are Atalaya (624 m), Chorlo (624 m), Morrón del Cotarro (615 m) and Manzano (610 m).

[6] The International Tagus Natural Park is a large protected area stretching between Spain and Portugal located at the northern limits of the Sierra de San Pedro range.