Reinosa is a municipality in Cantabria, Spain. As of 2009, it has 10,307 inhabitants. The municipality, one of the smallest by land area in Cantabria, is notable for being one of the nearest towns to the headwaters of the Ebro River. It is surrounded by the municipality of Campoo de Enmedio and was created a city by King Alfonso XIII in 1927, being one of only three urban centres in Cantabria with that honour, the others being Santander and Torrelavega.
The Ebro (Spanish and Basque [ˈeβɾo]; Catalan: Ebre, Western:[ˈeβɾe], Eastern:[ˈeβɾə]) is a river of the north and northeast of the Iberian Peninsula, in Spain. It rises in Cantabria and flows 930 kilometres (580 mi), almost entirely in an east-southeast direction. It flows into the Mediterranean Sea, forming a delta in the Terres de l'Ebre region, in southern Catalonia. In the Iberian peninsula, it ranks second in length after the Tagus and second in discharge volume, and drainage basin, after the Douro. It is the longest river entirely within Spain; the other two mentioned flow into Portugal.