The Gélise is a tributary of the Baïse

Baïse

The Baïse 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...

 River in Gascony

Gascony

Gascony is an area of southwest France that was part of the "Province of Guyenne and Gascony" prior to the French Revolution. The region is vaguely defined and the distinction between Guyenne and Gascony is unclear; sometimes they are considered to overlap, and sometimes Gascony is considered a...

, southwestern France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

.

Etymology

The name Gélise comes from the Aquitanian

Aquitanian language

The Aquitanian language was spoken in ancient Aquitaine before the Roman conquest and, probably much later, until the Early Middle Ages....

 hydronym

Hydronym

A hydronym is a proper name of a body of water. Hydronymy is the study of hydronyms and of how bodies of water receive their names and how they are transmitted through history...

ic root Jel, meaning "watercourse."

Geography

The Gélise originates in the Gers

Gers

The Gers is a department in the Midi-Pyrénées region in the southwest of France named after the Gers River.Inhabitants are called les Gersois or Gersoises.-History:...

 département at Cahuzères, north of Lupiac

Lupiac

Lupiac is a commune in the Gers department in southwestern France.-Geography:The Auzoue forms most of the commune's southeastern border.The Douze forms the commune's western border.-Population:-Literature:...

, then it flows northwest in the direction of Eauze

Eauze

Éauze is a commune in the Gers department in southwestern France.-History:Éauze takes its names from the Gaulish Aquitani tribe of the Elusates....

. It drains the land around Castelnau-d'Auzan

Castelnau-d'Auzan

Castelnau-d'Auzan is a commune in the Gers department in southwestern France.-Geography:A picturesque little village on the river Gélise on a crossing of roads, east of the city of Condom in the Gers bounding the departments Lot-et-Garonne and the Landes. It benefits of a privileged situation on...

, then it flows northeast where it forms the natural boundary between the forest of the Landes of Gascony, the slopes of the Armagnac-Ténarèze

Armagnac-Ténarèze

Armagnac-Ténarèze, one of the three terroirs in the Armagnac region where grapes for the distillation of the Armagnac eau-de-vie can be cultivated. This area lies between Bas-Armagnac and Haut-Armagnac, covering the northwestern part of the department of Gers and the southern part of Lot-et-Garonne...

.

It unites with the Baïse just after passing the fortified mill of Lavardac

Lavardac

Lavardac is a commune in the Lot-et-Garonne department in south-western France....

 in Lot-et-Garonne

Lot-et-Garonne

Lot-et-Garonne is a department in the southwest of France named after the Lot and Garonne rivers.-History:Lot-et-Garonne is one of the original 83 departments created during the French Revolution on March 4, 1790...

.

The Osse River

Osse River

The Osse is a long river in southwestern France, right tributary of the river Gélise. Its source is in the Hautes-Pyrénées, southeast of the village Bernadets-Debat, in the Plateau de Lannemezan...

, a right tributary, joins the Gélise near Nérac

Nérac

Nérac is a commune in the Lot-et-Garonne department in south-western France.-External links:*...

.

The Auzoue

Auzoue

The Auzoue is a long river in the Gers and Lot-et-Garonne départements, southwestern France. Its source is at Bassoues. It flows generally north...

, a right tributary, joins the Gélise at Mézin

Mézin

Mézin is a commune in the Lot-et-Garonne department in south-western France.This place is situated in Nerac, Lot-et-Garonne, Aquitaine, France, its geographical coordinates are 44° 3' 0" North, 0° 16' 0" East and its original name is Mézin...

.

Départements and principal cities

The Gélise passes through the following départements and cities:

• Gers: Dému
  Dému
  Dému is a commune in the Gers department in southwestern France.-Population:-Media:Dému features as a main setting in the Michael Ondaatje novel Divisadero.-References:*...
  
  , Eauze
  Eauze
  Éauze is a commune in the Gers department in southwestern France.-History:Éauze takes its names from the Gaulish Aquitani tribe of the Elusates....
  
  
• Lot-et-Garonne: Sos
  Sos, Lot-et-Garonne
  Sos is a commune in the Lot-et-Garonne department in south-western France.-See also:*Communes of the Lot-et-Garonne department...
  
  , Poudenas
  Poudenas
  Poudenas is a commune in the Lot-et-Garonne department in south-western France....
  
  , Mézin
  Mézin
  Mézin is a commune in the Lot-et-Garonne department in south-western France.This place is situated in Nerac, Lot-et-Garonne, Aquitaine, France, its geographical coordinates are 44° 3' 0" North, 0° 16' 0" East and its original name is Mézin...
  
  , Barbaste
  Barbaste
  Barbaste is a commune in the Lot-et-Garonne department in south-western France....