OB 4,5cm PAK is a World War II-era German military bunker located in southern France, near the Mediterranean coast. This defensive structure was part of the Atlantic Wall fortifications, a vast system of coastal defenses built by Nazi Germany between 1942 and 1944 to protect occupied Europe from Allied invasion. The designation 'OB' indicates it was an observation bunker, while '4,5cm PAK' refers to the 4.5 cm anti-tank gun that was likely installed here to defend against armored vehicles.
These bunkers formed a network of hardened positions designed to create overlapping fields of fire and observation along the French coastline.