The N-120 heads east into the Sierra del Suido past the Mondariz Baneario and the Puerto de Fontefría (790m).

Most traffic now takes the Autovía A-52, both roads enter the valley of Rio Miño to Ourense.

The river heads north east along the valley past the Cañón del Sil before leaving the valley to the east past Monforte de Lemos and then back into the Rio Sil valley which passes the southern end of the Cordillera Cantábrica and the towns of La Rúa and Barco de Valdeorras.

At Osorno la Mayor the road crosses the N-611 and the Río Pisuerga and the Canal de Castilla.

The road now heads through the Rioja region before entering the Ebro valley and Logroño.