La Teste-de-Buch (Occitan: "La Tèsta de Bug" [la ˈtèstɔ ðe ˈβytʃ/ˈβyk] or [la ˈtèstə ðœ ˈβytʃ/ˈβyk]) is a commune of the Gironde "département", in France. It is located on the south shore of Arcachon Bay, lying in the southwestern part of Gironde. It is the largest of four communes that comprise the...