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Baïse
River
Baise kanalbruecke.jpg
Canal bridge over the Baïse river
Country France
Regions Occitanie, Nouvelle-Aquitaine
Department Hautes-Pyrénées, Gers, Lot-et-Garonne
Communes Lannemezan, Trie-sur-Baïse, Mirande, Castéra-Verduzan, Valence-sur-Baïse, Condom, Nérac, Lavardac
Tributaries
 - left Gélise
 - right Baïsole, Petite Baïse, Auloue
City Auch
Source Pyrenees
 - location Plateau de Lannemezan, Occitanie, France
 - elevation 600 m (1,969 ft)
 - coordinates 43°06′17″N 0°21′20″E / 43.10472°N 0.35556°E / 43.10472; 0.35556
Mouth Garonne
 - location Saint-Léger, Nouvelle-Aquitaine, France
 - elevation 30 m (98 ft)
 - coordinates 44°17′07″N 0°19′17″E / 44.28528°N 0.32139°E / 44.28528; 0.32139
Length 188 km (117 mi)
Basin 2,910 km² (1,124 sq mi)
Discharge for Nérac
 - average 11.70 /s (413 cu ft/s)

The Baïse or Grande Baïse (Occitan: Baïsa) is a French river that flows through the Hautes-Pyrénées, Gers and Lot-et-Garonne departments, in the Occitanie and Nouvelle-Aquitaine regions.

The river's source is in the Pyrenees and is a left tributary of the Garonne river. In general, it flows from south to north.

Geography

The Baïse river has a length of 187.7 km (116.6 mi) and a drainage basin with an area of 2,910 km2 (1,124 sq mi).

Its average yearly discharge is 11.70 m3/s (413 cu ft/s) at Nérac, a small town of the Lot-et-Garonne department that is at about 20 km (12.4 mi) of the confluence with the Garonne river. The largest discharges are during winter and spring, with 23.00 m3/s (812 cu ft/s) in February.

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Average monthly discharge (m3/s) at Nérac

Course

The source of the Baïse is on the Plateau de Lannemezan, in the Capvern commune (Hautes-Pyrénées), at an altitude of about 600 m (1,969 ft).

The Baïse flows through 2 regions, 3 departments and 52 communes. Some of the communes are:

Finally, it flows into the Garonne river at Saint-Léger (Lot-et-Garonne), at 30 m (98 ft) of altitude.

Main tributaries

  • Left tributaries
    • Gélise - 92 km;
  • Right tributaries
    • Baïsole - 47 km;
    • Petite Baïse - 74.8 km;
    • Auloue - 45.3 km;

Gallery

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