The Asón is a river in Northern

Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...

, flowing through the

Autonomous Community The autonomous communities () are the first-level administrative divisions of Spain, created in accordance with the Spanish Constitution of 1978, with the aim of guaranteeing limited autonomy to the nationalities and regions that make up Sp ...

Cantabria Cantabria (, ; ) is an autonomous community and Provinces of Spain, province in northern Spain with Santander, Cantabria, Santander as its capital city. It is called a , a Nationalities and regions of Spain, historic community, in its current ...

. Its source is in the Collados del Asón Natural Park. It flows into the Cantabrian Sea in the town of Colindres, 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, Cantabria, Santander. Santoña is divided into two zones, ...

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 cer ...

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

See also