Donostialdea is one of the eight regions of Gipuzkoa, in the Basque Autonomous Community in Spain. It corresponds to the basin of the lower Urumea River, along with a strip of basin corresponding to the Oria River. The region's name is derived from Donostia, the Basque name of San Sebastián, the capital city of Gipuzkoa. The region comprises eleven municipalities extending in an area of 305.72 km2 (see below, data released in 2006). It borders in the east with the region or subcomarca of Oarsoaldea, on the south with Leitzaldea or Norte de Aralar in Spanish (Navarre), on the west with Urola Kosta and on the north with the Bay of Biscay.
#MunicipalityMayorPartyArea km²Population(2010)% Population1San SebastiánEneko GoiaEAJ/PNV60.89185,51057.02ErrenteriaJulen Mendoza PérezEH Bildu32.2639,01012.03HernaniLuis Intxauspe ArozenaEH Bildu39.8219,3175.94Lasarte-OriaPablo Barrio RamírezEH Bildu6.0117,8635.55PasaiaAmaya Aguirregabiria AlberdiEH Bildu11.3415,9884.96AndoainAna Maria Karrere ZabalaEH Bildu27.1714,6704.57OiartzunAiora Pérez de San Román EH Bildu59.719,9573.18UrnietaMikel Pagola TolosaEAJ/PNV22.406,1661.99LezoAinhoa Zabalo LoyarteEH Bildu8.596,0341.910UsurbilMertxe Aizpurua Olano EH Bildu25.646,0061.811AstigarragaAndoni Gartzia ArruabarrenaEH Bildu11.894,7141.4 Donostialdea305.72325,235100.0
The area is served by the San Sebastián Metro, part of the Euskotren Trena network operated by Euskotren.
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