Osse River

Osse
Country	France
Physical characteristics
Main source	Plateau de Lannemezan 350 m (1,150 ft) 43°20′18″N 00°19′37″E / 43.33833°N 0.32694°E / 43.33833; 0.32694
River mouth	Gélise 42 m (138 ft) 44°07′15″N 00°16′49″E / 44.12083°N 0.28028°E / 44.12083; 0.28028Coordinates: 44°07′15″N 00°16′49″E / 44.12083°N 0.28028°E / 44.12083; 0.28028
Length	120.3 km (74.8 mi)
Discharge	Average rate: 2.62 m3/s (93 cu ft/s)
Basin features
Progression	Gélise→ Baïse→ Garonne→ Atlantic Ocean
Basin size	600 km2 (230 sq mi)

The Osse is a 120 km (75 mi) long river in southwestern France, right tributary of the river Gélise. Its source is in the Hautes-Pyrénées, 2 km (1.2 mi) southeast of the village Bernadets-Debat, in the Plateau de Lannemezan. It joins the river Gélise 5 km (3.1 mi) southwest of the town Nérac.

Its course crosses the following départements and communes:

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