The Basque derby (in Basque Euskal Derbia, in Spanish derbi Vasco) is the name of the football local derby between Real Sociedad and Athletic Bilbao. It embodies the inter-city rivalry between Bilbao and Donostia-San Sebastián, capitals of the neighbouring provinces of Gipuzkoa and Biscay (Bizkaia) in the Basque Country region of Spain.[1][2] It is also occasionally referred to as the AP-8 derby, referring to the name of the highway which connects the cities.