The ancient Phoenician sea wall was originally a natural structure composed of petrified sand dunes. It was reinforced gradually by the Phoenicians with rocks, and the wall as it stands today took its present shape in the first century BC. The Phoenicians used this wall as protection against sea storms and invaders, while during Roman times it again functioned as a quarry.

The wall is 225 meters long and 1 to 1.5 meters thick. Parts of it have crumbled, but what remains still stands as a bulwark against the sea for the residents of the ancient city, itself a charming destination for a leisurely stroll through the labyrinthian residential alleys.