The Arlanza River rises in the

Sierra de la Demanda Sierra de la Demanda is a mountain sub-range situated in the northern Iberian Peninsula. The Sierra de la Demanda area provides the habitat for ''Lissotriton helveticus punctillatus'' (Schmidtler 1970), a subspecies of the palmate newt. Geograp ...

, near Quintanar de la Sierra in an area known as Fuente Sanza. As it flows through the

province A province is almost always an administrative division within a country or sovereign state, state. The term derives from the ancient Roman ''Roman province, provincia'', which was the major territorial and administrative unit of the Roman Empire ...

Burgos Burgos () is a city in Spain located in the autonomous community of Castile and León. It is the capital and most populated municipality of the province of Burgos. Burgos is situated in the north of the Iberian Peninsula, on the confluence of t ...

Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...

, it passes through the municipalities of

Castrovido Castrovido is a town in the province of Burgos, Castilla y Leon Castile, Castille or Castilla may refer to: Places Spain *Castile (historical region), a vaguely defined historical region of Spain covering most of Castile and León, all of the ...

Salas de los Infantes Salas de los Infantes is a municipality and city located in Burgos Province between La Rioja, Soria and Burgos in Spain. It is hilly with many foothills and mountains. The mountain range Sierra de la Demanda with the black lagoon, ''La Laguna Ne ...

, Covarrubias and Lerma, broadly east to west roughly parallel to and north of the

River Duero The Douro (, , ; es, Duero ; la, Durius) is the highest-flow river of the Iberian Peninsula. It rises near Duruelo de la Sierra in Soria Province, central Spain, meanders south briefly then flows generally west through the north-west part of ...

. Its main tributary is the

River Arlanzón A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

that joins near

Quintana del Puente Quintana del Puente is a municipality located in the province of Palencia, Castile and León, Spain. According to the 2004 census A census is the procedure of systematically acquiring, recording and calculating information about the members of ...

shortly before the Arlanza itself joins River

Pisuerga The Pisuerga is a river in northern Spain, the Duero's second largest tributary. It rises in the Cantabrian Mountains in the province of Palencia, autonomous region of Castile and León. Its traditional source is called Fuente Cobre, but it has b ...

which in turn joins the Duero. It gives its name to the Arlanza wine region, a Spanish Denominación de Origen.

References

{{coord, 42, 1, 51.03, N, 3, 35, 40.36, W, source:cawiki_region:ES_type:river, display=title Rivers of Spain Rivers of Burgos Rivers of Palencia Tributaries of the Pisuerga