The border is formed by the Rio Macãs it heads east crossing the Esla river to Zamora and the Duero river valley.

The road crosses to the south bank of the Rio Duero to the town and castle of Peñafiel.

After 52 km the road meets the N-110 and heads north out of the Duero Valley past El Burgo de Osma onto Soria.

The Parque natural de la Dehesa del Moncayo lies to the east.

The road ends at Junction 19 of the Autopista AP-68 and N-232 43 km north west of Zaragoza.