The Baïse (; ) is a long river in south-western France, left tributary of the Garonne. Its source is in the foothills of the Pyrenees, near Lannemezan. It flows north through the following départements and towns:

  • Hautes-Pyrénées: Lannemezan, Trie-sur-Baïse
  • Gers: Mirande, Castéra-Verduzan, Valence-sur-Baïse, Condom
  • Lot-et-Garonne: Nérac, Lavardac

It flows into the Garonne near Aiguillon.

Tributaries

  • Gélise (in Lavardac)
  • Osse (in Nérac)
  • Petite Baïse (in L'Isle-de-Noé)

References

  • River Baise guide Places, ports and moorings on the River Baise - french-waterways.com