The Asón is a river in Northern

Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = '' Plus ultra'' ( Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , ...

, flowing through the

Autonomous Community eu, autonomia erkidegoa ca, comunitat autònoma gl, comunidade autónoma oc, comunautat autonòma an, comunidat autonoma ast, comunidá autónoma , alt_name = , map = , category = Autonomous administr ...

Cantabria Cantabria (, also , , Cantabrian: ) is an autonomous community in northern Spain with Santander as its capital city. It is called a ''comunidad histórica'', a historic community, in its current Statute of Autonomy. It is bordered on the ea ...

. Its source is in the Collados del Asón Natural Park. It flows into the

Cantabrian Sea The Cantabrian Sea; french: Mer Cantabrique, gl, Mar Cantábrico, ast, Mar Cantábricu, eu, Kantauri. is the term used mostly in Spain to describe the coastal sea of the Atlantic Ocean that borders the northern coast of Spain and the southwes ...

in the town of

Colindres Colindres is a town in the northern Spanish province and autonomous community of Cantabria. Located between the cities of Santander and Bilbao, Colindres has a population of 8,453 ( INE 2018). Overview In Colindres, the Asón River flows in ...

, where it forms the

Santoña Santoña is a town in the eastern coast of the autonomous community of Cantabria, on the north coast of Spain. It is situated by the bay of the same name. It is from the capital Santander. Santoña is divided into two zones, an urban plain, and ...

estuary which is the most important

Special Protection Area A Special Protection Area (SPA) is a designation under the European Union Directive on the Conservation of Wild Birds. Under the Directive, Member States of the European Union (EU) have a duty to safeguard the habitats of migratory birds and cert ...

in the north of Spain. It has a length of 39 km.

See also