Castile-Leon in the context of "Douro River"

The province of Burgos is a province of northern Spain, in the northeastern part of the autonomous community of Castile and León. It is bordered by the provinces of Palencia, Cantabria, Vizcaya, Álava, La Rioja, Soria, Segovia, and Valladolid. Burgos is the province of Spain that has borders with most provinces. Its capital is the city of Burgos.

The Cartularies of Valpuesta from the monastery Santa María de Valpuesta, in Burgos, are considered to be the oldest known documents containing words written in the Spanish language.

Valladolid (Spanish: [baʎaðoˈlið] ) is a province of northwest Spain, in the central part of the autonomous community of Castile and León. It has a population of 525,398 across a total of 225 municipalities, an area of 8,110 km (3,130 sq mi), meaning a population density of 64.77 people per km.

The capital is the city of Valladolid. It is bordered by the provinces of Zamora, León, Palencia, Burgos, Segovia, Ávila, and Salamanca. It is the only Spanish province surrounded entirely by other provinces of the same autonomous community. It is the only peninsular province which has no mountains.

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.

Historically a larger region (merindad), Enkarterri stretched from the mountains that form its southern border with Cantabria and Castile-Leon in the west and south, to the river Nervión and the Estuary of Bilbao in the east – including the industrial municipalities of Gallarta, Muskiz, Ortuella, Portugalete, Santurtzi, Sestao, Trapagaran and Zierbena. Nowadays the name usually refers only to the rural western part of the historical territory, while the eastern urban area is known as the Left Bank (Margen Izquierda / Ezkerraldea) and is part of the Greater Bilbao comarca (together with Barakaldo, which used to belong to the neighbouring merindad of Uribe).

Soria is a province of central Spain, in the eastern part of the autonomous community of Castile and León. Most of the province is in the mountainous Sistema Ibérico area.

Palencia is a province of northern Spain, in the northern part of the autonomous community of Castile and León in the north of the Iberian Peninsula. It is bordered by the provinces of León, Cantabria, Burgos, and Valladolid.

Segovia (Spanish pronunciation: [seˈɣoβja] ) is a province of central/northern Spain, in the southern part of the autonomous community of Castile and León. It is bordered by the province of Burgos in the north, Soria in the northeast, Guadalajara in the east, Madrid in the south, Ávila in the west and southwest, and Valladolid in the northwest. The average temperature ranges from 10 °C to 20 °C.