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") , i ...

, flowing through the Autonomous Community of Cantabria. Its source is in the

Collados del Asón Natural Park Collados del Asón Natural Park ( es, Parque Natural de los Collados del Asón) is a natural park that includes parts of the Asón River, Cantabria, Spain. It was declared as a Natural Park by Cantabria on 18 February 1999. It is located in the ...

. It flows into the Cantabrian Sea 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 into the ...

, 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 a ...

estuary which is the most important Special Protection Area in the north of Spain. It has a length of 39 km.

See also