The Treviño Enclave (Basque: Trebiñuko Barrendegia Spanish: Enclave de Treviño) in northern Spain is part of the territory of the province of Burgos (part of Castile and León), but is completely surrounded by the territory of the Basque Country province of Álava.
Thus, it is an enclave of the Basque Country and an exclave of Castile and León.
It consists of two municipalities—Condado de Treviño and La Puebla de Arganzón—and is part of the legal district (partido judicial) of Miranda de Ebro in the province of Burgos.

The enclave consists of the municipalities of Condado de Treviño, with an area of 260.71 square kilometres (100.66 sq mi) and a 2009 population of 1,432, giving it a population density of 5.49 per square kilometre (14.2/sq mi) and La Puebla de Arganzón, with an area of 18.87 square kilometres (7.29 sq mi) and a 2009 population of 529, giving it a population density of 28.03 per square kilometre (72.6/sq mi).
This gives the enclave as a whole an area of 279.58 square kilometres (107.95 sq mi) and a 2009 population of 1,961, for a population density of 6.77 per square kilometre (17.5/sq mi).
The Treviño Enclave (Basque: Trebiñuko Barrendegia Spanish: Enclave de Treviño) in northern Spain is part of the territory of the province of Burgos (part of Castile and León), but is completely surrounded by the territory of the Basque Country province of Álava. Thus, it is an enclave of the Basque Country and an exclave of Castile and León. It consists of two municipalities—Condado de Treviño and La Puebla de Arganzón—and is part of the legal district (partido judicial) of Miranda de Ebro in the province of Burgos.
The enclave consists of the municipalities of Condado de Treviño, with an area of 260.71 square kilometres (100.66 sq mi) and a 2009 population of 1,432, giving it a population density of 5.49 per square kilometre (14.2/sq mi) and La Puebla de Arganzón, with an area of 18.87 square kilometres (7.29 sq mi) and a 2009 population of 529, giving it a population density of 28.03 per square kilometre (72.6/sq mi). This gives the enclave as a whole an area of 279.58 square kilometres (107.95 sq mi) and a 2009 population of 1,961, for a population density of 6.77 per square kilometre (17.5/sq mi).
Treviño enclave