As its own name indicates, this comarca extends over the western coast of the autonomous community, from its border with Asturias by the mouth of the Deva River, to the Saja-Besaya mouth in Suances, although this limits may vary depending on the source, since this comarca, as the rest of Cantabria's, is not regulated, but there are common characteristic elements in the municipalities that belong to it.

This zone has great tourism assets like beaches, nature, gastronomy and culture.

Santillana del Mar, Comillas, Suances and San Vicente de la Barquera are the municipalities of greater renown, both in the comarca and in Cantabria, so they are the main destinations for tourists.

Three of the longest rivers of Cantabria flow into the Western coast: The Deva, the Nansa and the Saja-Besaya.

As has been mentioned, the culture of the zone is quite remarkable, since in a few kilometers-radius many cultural spots are concentrated: the Altamira Cave and Museum, the Zoologic and Botanic Garden, the Collegiate Church in Santillana del Mar; and the Sobrellano Palace, the Comillas Pontifical University and the Gaudí Caprice in Comillas.