Its capital city, Vitoria-Gasteiz, is also the seat of the political main institutions of the Basque Autonomous Community. It borders the Basque provinces of Biscay and Gipuzkoa to the north, the community of La Rioja to the south, the province of Burgos (in the community of Castile and León) to the west and the community of Navarre to the east. The Enclave of Treviño, surrounded by Alavese territory, is however part of the province of Burgos, thus belonging to the autonomous community of Castile and León, not Álava.