The N-122 is a national road that connects Aragon with Castilla y León and Portugal, through the Douro Valley. It crosses the cities of Soria, Valladolid and Zamora. Its entrance into the province of Burgos is located next to the Duero river, crossing the towns of Fresnillo de las Dueñas, Aranda de Duero and Castrillo de la Vega, an undivided variant of Fuentecén and Nava de Roa.
