The Ptolemais aqueduct is of a type common in the ancient world. It consists of a concrete channel, several layers thick, though this seems to vary (see Pl. XIVa and sections), which is set in a framework of roughly-dressed, mortared stone. The channel itself rests in a bed of mortar which in turn is based either on stone foundations or the Gebel bed rock (see Pl. XIII and sections). The upper surface of the supporting framework was cemented on each side like the channel itself. Throughout the aqueduct's length the channel width varies considerably, but averages about 0·40 m.

The country through which the aqueduct passes on the north side of the Gebel Akhdar is arid, stony and covered with often dense scrub. A series of wadis running from the Gebel to the sea cuts the twenty-four kilometres between Wadi Habbun, where the aqueduct begins its course, and Tolmeita where it completes it. To carry the water for Ptolemais over these wadis bridges were constructed.

The condition of the aqueduct varies throughout its length. In some places, such as between Wadis Habbun and El-Meleca, it runs continuously for over one kilometre, but for the same distance on the east side of Sidi Belgasem it cannot be traced. Some pieces of it are complete and with only minor repairs would be ready for use but in other places only the channel or stone framework remain. Nevertheless it is possible to follow the aqueduct's course from Wadi Habbun to the city walls of Ptolemais. Only its actual source in Wadi Habbun, its course in Wadi El-Meleca, and in Wadi El Rumman, and its disappearance at the city walls raise questions as yet unanswered.