Douze
The Douze in Mont-de-Marsan
Course of the Douze
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Location
Country	France
Physical characteristics
Source
• location	Gers
Mouth
• location	Midouze
• coordinates	43°53′29″N 0°30′9″W / 43.89139°N 0.50250°W / 43.89139; -0.50250
Length	124 km (77 mi)
Basin features
Progression	Midouze→ Adour→ Atlantic Ocean

The Douze (French pronunciation: [duz] ^ⓘ; Occitan: Dosa) is the right source river of the Midouze, in the Landes, in the southwest of France. It is 123.5 km (76.7 mi) long.^[1]

The Douze rises in Armagnac, in the Gers département. It joins the Midou in Mont-de-Marsan to constitute the Midouze, a tributary of the Adour.

• Gers: Peyrusse-Grande, Espas, Manciet, Cazaubon.
• Landes: Labastide-d'Armagnac, Saint Justin, Roquefort.

• (R) Estampon, in Roquefort.
• (R) Gouaneyre.