are notable examples of the cirque formation.

Low passes are lacking, and the principal roads and the railroads between France and Spain run only in the lowlands at the western and eastern ends of the Pyrenees, near sea level. The main passes of note are:
* Col de la Perche 1581 m, towards the east, between the valley of the Têt and the valley of the Segre,
* Col de Puymorens