The northern, which was called the "Sidonian," because it looked towards Sidon, was situated on the east of the main island, towards the northern end of it.

On the west and south the land swept round it in a natural curve, effectually guarding two sides; while the remaining two were protected by art.

On the north a double line of wall was carried out in a direction a little south of east for a distance of about three hundred yards, the space between the two lines being about a hundred feet.

The northern line acted as a sort of breakwater, the southern as a pier.
This last terminated towards the east on reaching a ridge of natural rock, and was there met by the eastern wall of the harbour, which ran out in a direction nearly due north for a distance of 250 yards, following the course of two reefs, which served as its foundation.
Between the reefs was a space of about 140 feet, which was left open, but could be closed, if necessary, by a boom or chain, which was kept in readiness.

The dimensions of this northern harbour are thought to have been about 370 yards from north to south, by about 230 from east to west,[423] or a little short of those which have been assigned to the northern harbour of Sidon.