title: Gélise
text: # Gélise
  
  The Gélise (pronounced) is a tributary of the river Baïse in Gascony, southwestern France. It is 92.0 km (57.2 mi) long.
  
  ## Etymology
  
  The name Gélise comes from the Aquitanian hydronymic root Jel, meaning "watercourse."
  
  ## Geography
  
  The Gélise originates in the Gers département at Cahuzères, north of Lupiac, then it flows northwest in the direction of Eauze. It drains the land around Castelnau-d'Auzan, then it flows northeast where it forms the natural boundary between the forest of the Landes of Gascony, the slopes of the Armagnac-Ténarèze.
  
  It unites with the Baïse just after passing the fortified mill of Lavardac in Lot-et-Garonne.
  
  The Osse, a right tributary, joins the Gélise near Nérac. The Auzoue, a right tributary, joins the Gélise at Mézin. The Izaute, a right tributary, joins the Gélise at Saint-Pé-Saint-Simon.
  
  ## Départements and principal cities
  
  The Gélise passes through the following départements and cities:
  
  * Gers: Dému, Eauze
  * Lot-et-Garonne: Sos, Poudenas, Mézin, Barbaste
  