Route nationale 20

The road forks at Col de Puymorens with one branch being the Route nationale 22 which leads to Andorra.

Paris - Étampes - Orléans - Vierzon - Châteauroux - Limoges - Brive-la-Gaillarde - Cahors - Montauban - Toulouse - Pamiers - Foix - Bourg-Madame - Spain (N-152) The road starts at the south of the city centre of Paris at the Porte d'Orléans.

The N20 merges again as the Route d'Orléans through Montlhéry and over the N104 and into open rolling countryside which becomes increasingly wooded.

The N20 crosses the river Loire in the City Centre over the Pont du Maréchal Joffre.

The road then reaches the industrial centre of Limoges which lies on the river Vienne.

The roads are now on the plateau of the Causse de Gramat and onto the medieval town of Cahors on a loop in the river Lot.

The N20 continues south heading out of the massif central and into the valley of the river Aveyron via Caussade.

The N20 turns south running along the east bank of the river into the industrial city of Toulouse.

The road leaves the city centre to the south on the west bank of the River Garonne.

South of Pamiers the road enters the foothills of the Pyrenees such as the Montagnes du Plantaurel.

The road passes the Parc Pyrénéen de l'Art Préhistorique and south east to Ax-les-Thermes.

The N22 leads in a series of hairpins to the south west and Andorra, crossing the Pas de la Casa (2,085m) or the alternative Túnel d'Envalira.