spelling or Avignoun in Mistralian spelling. The inhabitants of the commune are called avinhonencs or avignounen in both standard Occitan and Provençal dialect. History Geography Avignon is on the left bank of the Rhône river, a few kilometres above its confluence with the Durance, about south-east of Paris, south of Lyon and north-north-west of Marseille. On the west it shares a border with the department of Gard and the communes of Villeneuve-lès-Avignon and Les Angles and to the south it borders the department of Bouches-du-Rhône and the communes of Barbentane, Rognonas, Châteaurenard, and Noves. The city is in the vicinity of Orange (north), Nîmes, Montpellier (south-west), Arles (to the south), Salon-de-Provence, and Marseille (south-east). Directly contiguous to the east and north are the communes of Caumont-sur-Durance, Morières-lès-Avignon, Le Pontet, and Sorgues. Geology and terrain The region around Avignon is very rich in limestone which is used for building material. For example, the current city walls, measuring 4,330 metres long, were built with the soft limestone abundant in the region called mollasse burdigalienne. Enclosed by the city walls, the Rocher des Doms is a limestone elevation of Urgonian type, 35 metres high (and therefore safe from flooding of the Rhone which it overlooks) and is the original core of the city. Several limestone massifs are present around the commune (the Massif des Angles, Villeneuve-lès-Avignon, Alpilles...) and they are partly the result of the oceanisation of the Ligurian-Provençal basin following the migration of the Sardo-Corsican block. The other significant elevation in the commune is the Montfavet Hill – a wooded hill in the east of the commune. The Rhone Valley is an old alluvial zone: loose deposits cover much of the ground. It consists of sandy alluvium more or less coloured with pebbles consisting mainly of siliceous rocks. The islands in the Rhone, such as the Île de la Barthelasse, were created by the accumulation of alluvial deposits and also by the work of man. The relief is quite low despite the creation of mounds allowing local protection from flooding. In the land around the city there are clay, silt, sand, and limestone present. Hydrography The Rhone passes the western edge of the city, but is divided into two branches: the Petit Rhône, or "dead arm", for the part that passes next to Avignon and the Grand Rhône, or "live arm", for the western channel which passes Villeneuve-lès-Avignon in the Gard department.