The most important city of Phoenicia towards the north was Arvad, or Aradus. Arvad was situated, like Tyre, on a small island off the Syrian coast, and lay in Lat. 34º 48´ nearly. It was distant from the shore about two miles and a half. The island was even smaller than that which formed the nucleus of Tyre, being only about 800 yards, or less than half a mile in length, by 500 yards, or rather more than a quarter of a mile in breadth.[435] The axis of the island was from north-west to south-east. It was a bare rock, low and flat, without water, and without any natural soil. The iron coast was surrounded on three sides, the north, the west, and the south, by a number of rocks and small islets, which fringed it like the trimming of a shawl. Its Phoenician occupiers early converted this debatable territory, half sea half shore, into solid land, by filling up the interstices between the rocks with squared stones and a solid cement as hard as the rock itself, which remains to this day.[436] The north-eastern portion, which has a length of 150 yards by a breadth of 125, is perfectly smooth and almost flat, but with a slight slope towards the east, which is thought to show that it was used as a sort of dry dock, on which to draw up the lighter vessels, for safety or for repairs.[437] The western and southern increased the area for house-building. Anciently, as at Tyre, the houses were built very close together, and had several storeys,[438] for the purpose of accommodating a numerous population. The island was wholly without natural harbour; but on the eastern side, which faced the mainland, and was turned away from the prevailing winds, the art and industry of the inhabitants constructed two ports of a fair size. This was effected by carrying out from the shore three piers at right angles into the sea, the central one to a distance of from seventy to a hundred yards, and the other two very nearly as far--and thus forming two rectangular basins, one on either side of the central pier, which were guarded from winds on three sides, and only open towards the east, a quarter from which the winds are seldom violent, and on which the mainland, less than three miles off, forms a protection. The construction of the central pier is remarkable. It is formed of massive blocks of sandstone, which are placed transversely, so that their length forms the thickness of the pier, and their ends the wall on either side. On both sides of the wall are quays of concrete.[439]