The range's highest point is at the peak of Cuchillón, although its exact altitude differs by source, including: 2,174 metres (7,133 ft) according to the National Geographic Institute of Spain (Instituto Geográfico Nacional); and 2,222 metres (7,290 ft) according to Francisco Hernández-Pacheco and in other publications by the same National Geographic Institute.

[1][2] This system marks the boundary between the regions of Campoo in Cantabria and La Pernia in Palencia of Castile and León.

The southeastern sector, extending from Sestil to Alto de Hoyos, is the lowest and is called the Cinto Brotherhood.

According to cartographic studies by the National Geographic Institute of Spain and other works, the name "Peña Labra" is often used to refer to this system, especially as seen from the south side.

However, all previously existing mapping, including the first series of the National Geographic Institute, or those of Francisco Coello and Quesada and Pascual Madoz, refers to this mountain as "Sierra de Híjar."