Estuary of San Vicente, mouth of the Escudo river.
The Escudo hydrographic basin is the set of surfaces that pour water into the Escudo river, which rises in the Sierra del Escudo de Cabuérniga and pours its waters into the Cantabrian Sea in the San Vicente estuary. It has a total of 71.93 km, entirely within the autonomous community of Cantabria (Spain), a perimeter of 45.68 km and an average slope of 27.34%. The Escudo River rises at 690 meters above sea level and flows to some 19.5 meters above sea level, measured in the Rubín marshland. The basin is divided between the municipalities of Cabezón de la Sal, Valdáliga and San Vicente de la Barquera.
The lithic resources of the basin, ordered from south to north, are fundamentally: sandstones stratified in layers of 1 m (occupy 19.74% of the surface), clays and limonites (19.62%) and nodular marls and clayey limestones (17.61%), all interspersed with smaller layers of other materials, mainly limestone and alluvium.
Most of the basin area, 43.7%, is covered by grasslands. They are followed by the pre-forest (17.3%), the heather (15.5%) and the forest (10.8%). Only 0.9% is urban area. Main rivers Bibliography
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