Baïse

The Baïse (Baïsa) is a 188 km 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)