It is located in the upper courses of the Asón and Agüera rivers, near the border with Vizcaya in the Basque Country.

Lesser populated places are: Valle de Villaverde (286) Arredondo (470) and Rasines (952).

Asón Valley is known for its rugged solid limestone, which house inside caving extraordinary wealth and ancient forests of beech, oak and holm undoubtedly the most notable in the eastern part of Cantabria.

Historical and municipal limits of Soba exceed those of geographically understood valley, and also include the headwaters of the Asón, the right bank of the valley of the river Miera (Valdició village in the municipality of Soba) and the left bank of the valley of the river Calera, bordering with the province of Vizcaya.

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