Within it there are represented a castle -in memory of the town's origins- an oak and olive -the most common trees in the surroundings-, the villa declaration -by which Castilblanco got sovereignty in 1554- and a rock-rose flower, in memory of the comarca of La Jara (The Rock-Rose), to which Castilblanco belonged until its incorporation to the province of Badajoz after the fall of the Old Regime.

[3]The municipality is located within the comarca of La Siberia, which borders with the provinces of Cáceres, Ciudad Real and Toledo.

The northern area of the municipality consists of a wide raña soil, undermined by narrow valleys with north-south orientation.

The eastern area of the municipality has the most irregular relief, while both the western and southern countryside consists generally of fields with gentle slopes.

The southern boundary of the municipality, where both the Guadiana and Guadalupe rivers converge, is also a mountainous terrain bounded by the ranges of Barbas de Oro, Pastillos, Chimenea, Escorial, Villares y Golondrinos.

In April 1556 Castilblanco was granted the formal title of Villa (town) by King Carlos I, at the request of the Archbishop of Toledo.

The socialist rally went ahead and the Civil Guard detachment based in the village intervened to disperse it at the instructions of the mayor of the municipality.

A crowd of villagers confronted the civil guards who, as elsewhere in rural Spain, were resented as an unpopular and repressive force deliberately recruited from outside the region where they were stationed.