The Petite Baïse (French: la Petite Baïse) is a 74.9 km (46.5 mi) long river in the Hautes-Pyrénées and Gers départements, southwestern France. Its source is in Lannemezan, on the plateau de Lannemezan. It flows generally north. It is a right tributary of the Baïse into which it flows in l'Isle-de-Noé.
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