Bassussary is located in the former province of Labourd and within the urban area of Bayonne some 5 km south-east of Biarritz and 4 km south by south-west of Bayonne. Access to the commune is by the D932 road from Anglet in the north which passes through the commune on the eastern side and continues south to Ustaritz. The town is in the west of the commune and can be accessed by the D254 road which branches from the D932 on the northern border of the commune and continues through the town west to join the D810 south-west of Biarritz Airport. The D3 comes from the A63 autoroute Exit (Bayonne-Sud) to the town then south forming the western border of the commune and continuing to Arcangues. South-east of the town is another urban area of Betbeder. Much of the commune is urbanised with some areas of forest and meadows. The eastern part next to the D932 contains an industrial estate.