There were springs of water within the walls which yielded an unfailing supply.

The walls were of great strength, and a considerable portion of them is still standing, and attests the skill of the Phoenician architects.

The blocks in the lower courses are mostly of a large size, some of them six feet long, or more, and bear in many cases the well-known Phoenician mason-marks.[5112] They are laid without cement, like those of Aradus and Sidon, and recall the style of the Aradian builders, but are at once less massive and arranged with more skill.

The breadth of the wall is about seven feet.

At intervals it is flanked by square towers projecting from it, which are of even greater strength than the curtain between them, and which were carried up to a greater height.