Comarcas of Biscay

administrative division of the province of Biscay, in the Basque Country, Spain

Busturialdea, also named Busturialde - Urdaibai is a comarca of the province of Biscay, in the Basque Country, Spain. It is the heir of "Busturia", one of the original merindades that used to compose the province of Biscay – this should not be confused with Busturia, a municipality located in this region. Busturialdea is a diminished portion of the same original subregion and has two capital cities; Bermeo and Gernika-Lumo. It is one of the seven comarcas that compose the province of Biscay.

Enkarterri (Spanish: Las Encartaciones) is a comarca of the province of Biscay, in the Basque Country, Spain. It is one of the seven eskualdeak/comarcas or districts that make up the province of Biscay. Its administrative centre is Balmaseda.

Durangaldea (Spanish: Duranguesado) is a comarca of Biscay located in the Basque Country, Spain. It is one of the seven eskualdeak/comarcas or regions that compose the province of Biscay. The capital city of Durangaldea is Durango.

Arratia-Nerbioi (Spanish: Arratia-Nervión) is a comarca of the province of Biscay, in the Basque Country, Spain. It is formed by the valleys of the Arratia river and the Nervión river. It is one of the seven eskualdeak or comarcas that compose the province of Biscay.

Lea-Artibai is an eskualdea/comarca of the province of Biscay (Bizkaia), in the Basque Country, Spain. Lea-Artibai is the heir of the historical merindad of Markina, which was one of the merindades of Biscay. Currently, Lea-Artibai is one of the seven comarcas that compose the province. Its capital city is Markina-Xemein.