The department was creates with the French Revolution, on March 4, 1790 pursuant to the law of December 22, 1789, starting from part of the old province of Gascogne. In 1808, it was cuts down by a part in the North-East (canton of Lavit) to create the department of Tarn-et-Garonne.
Gers belongs to the Midday-Pyrenees area. It is bordering on the departments of the Hautes-Pyr?n?es, the Haute-Garonne, Tarn-et-Garonne, Lot-et-Garonne, the Moors and the Yr?n?es-Atlantiques.
Gers is known for its undulating landscapes. The moving hills are entrecoupees small valleys or are often dissimulated artificial lakes dedicate to agriculture.