Gers is bordered by the département of Lot-et-Garonne [region of Aquitaine] to the north, Tarn-et-Garonne to the northeast, Haute-Garonne to the east and southeast, Hautes-Pyrénées to the south, and Landes [region of Aquitaine] to the east.
It is bordered, to the north, by the département of Tarn-et-Garonne, to the northeast by Tarn, to the southeast by Ariège, to the south by Spain, to the southwest by Hautes-Pyrénées and to the west by Gers.
It is surrounded by the Département of Gers to the north, Haute-Garonne to the east, Spain to the south and the département of Pyrénées-Atlantiques [region of Aquitaine] to the west.