San Martín de Trevejo is located between the Sierra de Gata and the Portuguese border, where the language of the valley, known as “a fala” or “mañegu”, is currently only spoken by about 6,000 people in the area.

The history of this place is reflected in its rich heritage, notably the main square, bell tower, house of the Commandery and Church of San Martín de Tours - a building of three naves housing three canvases by the sixteenth-century painter Luis de Morales Pacense, "The Divine". Its traditional three-storey half-timbered houses take the visitor to another era, rustic local homes where the pig destined for slaughter was fattened on the ground floor, now also used to make the rich broths for which the village is renowned.

San Martín de Trevejo is an "Asset of Cultural Interest with the category of Historic Site", a recognition received for its excellently preserved architecture. A stream flows through its streets all year round, and is used to irrigate the municipality's terrains. This water channel runs through the following streets: Calle Ciudad, Corredera, Fuente, Guardia Civil and Hospital. Its path through the village is of particular architectural interest.