From the Wikipedia page 
The Gers (French: le Gers, pronounced [ʒɛʁs] or [ʒɛʁ]; Gascon/Occitan: Gers [gɛɾs]) is a department in the Occitanie region in the southwest of France named after the Gers River.
Inhabitants are called les Gersois.
The Gers is one of the original 83 departments created during the French Revolution on 4 March 1790. It was created from parts of the former provinces of Guyenne and Gascony.
In 1808 it lost Lavit on its north-eastern side to the newly created department of Tarn-et-Garonne.
Located in southwestern France, the Gers is part of the Occitanie region. It is surrounded by the departments of Hautes-Pyrénées, Haute-Garonne, Tarn-et-Garonne, Lot-et-Garonne, Landes, and Pyrénées-Atlantiques.