San Sebastián, officially known by the bilingual name Donostia / San Sebastián, is a city and municipality located in the Basque Autonomous Community in Spain. It lies on the coast of the Bay of Biscay, 20 km from the France–Spain border. The capital city of the province of Gipuzkoa, it has a population of 188,487 as of 2024, with its metropolitan area being 436,500 in 2010. Locals call themselves donostiarra (singular) in Basque, also using this term when speaking in Spanish. It is also a part of Basque Eurocity Bayonne-San Sebastián.