Boulogne-sur-Gesse (French pronunciation: [bulɔɲ syʁ ʒɛs], literally Boulogne on Gesse; Gascon: Bolonha de Gessa) is a commune of the Haute-Garonne department in southwestern France.
The river Gesse forms most of the commune's eastern border, while the Gimone forms part of its southwestern and northwestern borders.
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