The Lez (French pronunciation: [lɛz]; Occitan: Les) is a 29.6-kilometre (18.4 mi) river in the Hérault department in southern France.^[1] It is the main river of the city of Montpellier. The river has its source in the forest 5 km north of Saint-Clément-de-Rivière and it flows into the Mediterranean Sea at Palavas-les-Flots after first passing between two large lagoons and intersecting with the Canal du Rhône à Sète. Its longest tributary is the Mosson. The small fish Cottus petiti is endemic to a short stretch of the Lez.

Le Lez
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Native name	Le Lez (French)
Location
Country	France
Physical characteristics
Source
• location	Saint-Clément-de-Rivière
• coordinates	43°43′5″N 3°50′39″E / 43.71806°N 3.84417°E / 43.71806; 3.84417
Mouth
• location	Mediterranean Sea (Palavas-les-Flots)
• coordinates	43°31′33″N 3°56′2″E / 43.52583°N 3.93389°E / 43.52583; 3.93389
Length	29.6 kilometres (18.4 mi)