Urumea

Infobox River
river_name = Urumea


caption = The Urumea at San Sebastian
origin = Basque mountains
mouth = Cantabrian Sea (Bay of Biscay)
basin_countries = Spain
length = 59.4 km
elevation = 1,136 m
discharge = 13.63 m³/s
watershed = 279 km²

The Urumea (arguably stemming from Basque "ur" 'water' + "me(he)a" 'thin'; IPA: [u'ɾumea] or [uɾu'mea] ) is a river in the Basque Country at the north of the Iberian Peninsula. It's one of a series of Basque rivers flowing into the Bay of Biscay (Atlantic basin) and best known for being the river flowing to the sea on the city of San Sebastian. Its length is 59.4 km from its source in the Navarrese municipality of Goizueta, 33 of them running through the province Gipuzkoa. The average temperature is 13.5 ºC (56.3 ºF) and the seasonal and year-to-year variation in water flow is less marked than in other basins of Gipuzkoa, the natural regulation of the basin proving very high.

The lower stretch of the river has wide and flat banks fit for crops and urban development, which has resulted in the most inhabited drainage basin in Gipuzkoa, numbering 212,564 inhabitants. The main towns on the river are Hernani, with the first industrial estates upstream locating on its banks (paper and chemical industry, an aluminium mill, lift fabrication,...), Astigarraga, renown for its cider houses, and a final long stretch snaking through different parts of Donostia. The main focus of cider houses concentrates on a strip along the left bank in Hernani and on a minor road sloping up from the right bank at the limit between Astigarraga and the outer lands of Donostia.

The quality of the water is fairly good, despite a slight deterioration downstream on nearing the mouth (moderate-good condition), where the city of Donostia lies. However, lately works have been done for the treatment and cleaning of water, resulting in an outstanding environmental recovery. Therefore, the fish fauna remains stable at the moment with five species populating the river, namely salmon (extinct in 1940 and restored thanks to the repopulation programs of 1980s), trout, "ezkailu" ("Phoxinus phoxinus"), loach and eel.