The N-420 runs north through the heavily wooded Sierra Morena passing over the Puerto de Niella (902m) then crossing the valley of the Rio Montoro before taking the Puerto Pulido to Puertollano.
The N-420 travels north through the densely forested Sierra Morena, crossing over the Puerto de Niella (902m), then traversing the valley of the Rio Montoro before reaching the Puerto Pulido and Puertollano.