On that side it is sheltered by a huge breakwater, over 2 m.
East of the breakwater and parallel to it for 2700 ft.
A breakwater three-quarters of a mile long protects the entrance to the harbour.
Of Pharos and partly formed by a breakwater (built 1871-1873 and prolonged 1906-1907), 2 m.
It is dominated, on the seaward side, by four hills, and approached by a narrow entrance, with forts on either hand; a breakwater affords shelter on the east, and on the west is the Arsenal Basin, often regarded as the original harbour of the Carthaginians and Romans.