| Arcis Larcis | |
| Pushpin Map: | France#France Nouvelle-Aquitaine |
| Mouth Coordinates: | 43.6312°N -0.2325°W |
| Subdivision Type1: | Country |
| Length: | 34.8km (21.6miles) |
The Arcis[1] or Larcis (with article agglutination; Occitan (post 1500);: Arsís) is a river in Southwestern France. It is a right tributary of the Léez, originating in the commune Luc-Armau in the east of the Pyrénées-Atlantiques. It joins the Léez in Lannux, in the French département of the Gers. It is 34.8km (21.6miles) long.
The name is documented as Arsiis (1540), Arciis (1542), Arcis (1863). The name of the Arcison, a left tributary of the Layon, is related.