Barbazan is aSpa town in theComminges region located some 13 km south-west ofSaint-Gaudens and 12 km north ofCierp-Gaud. The western border of the commune is also the departmental border betweenHaute-Garonne andHautes-Pyrénées. Access to the commune is byRoute nationale N125 which comes from the end of theA645 autoroute and passes down the western side of the commune south toOre. The D26E road comes fromLabroquère in the north-west and passes through the north of the commune ending in the village. The D26 comes fromValcabrère in the west and passes through the village continuing toSauveterre-de-Comminges in the east. The D33D and the D33L go south from the village to join the N125. The commune has extensive forests in the east with some farmland in the west.[3]
TheGaronne river forms most of the western border of the commune as it flows north, passing throughToulouse, to eventually join theDordogne to form theGironde estuary atBordeaux. Lake Barbazan, north-west of the village at 452 m above sea level, is of glacial origin. It is surrounded bymoraine deposits: sub-glacial moraine from Cumania and rocky outcrops of moraine west of the Lake. TheRuisseau de Corp flows west from the lake to join the Garonne.[3]
Vert, 3 jets of water Argent issuant from a fountain with antique base of Or on a wave Argent mouvant from base; in chief parti per pale: at 1 Gules with 4 otelles Argent addorsed saltrirewise, at 2 Azure with a cross of Or.