This harbour is in form circular, and sufficiently defended from all winds, but its entrance is too narrow, and within, it is full of rocks. The bottom of the whole port is covered with large ramifications of white coral, with huge black stones; and I could no where observe there were above three fathom water, when it was full sea. The pilot indeed said there were seven, or twelve at the mouth; but so violent a tide rushed in through the entrance, that no vessel could escape being driven upon the rocks, therefore I made no draught of it. Dobelew is a village three miles south-west of the harbour. It consists of about eighty houses, built of stone drawn from the sea; these calcine like shells, and make good enough morter, as well as materials for building before burning. All the houses are covered with bent-grass, like those of Arabia. The 17th, I got my large quadrant a-shore, and observed the sun in the meridian in that village, and determined the lat. of its south-west extremity, to be 15° 42´ 22´´ north. Irwee is a village still smaller than Dobelew, about four miles distant. From this observation, compared with our account, we computed the southern cape of Dahalac, called _Ras Shouke_, to be in lat. 15° 27´ 30´´; and Ras Antalou, or the north cape, to be in lat. 15° 54´ 30´´ north. The whole length of the island, whose direction is from north-west to south-east is thirty-seven miles, and its greatest breadth eighteen, which did within a very little agree with the account the inhabitants gave us, who made its length indeed something more. Dahalac is by far the largest island in the Red Sea, as none, that we had hitherto seen, exceeded five miles in length. It is low and even, the soil fixed gravel and white sand, mixed with shells and other marine productions. It is destitute of all sorts of herbage, at least in summer, unless a small quantity of bent grass, just sufficient to feed the few antelopes and goats that are on the island. There is a very beautiful species of this last animal found here, small, short-haired, with thin black sharp horns, having rings upon them, and they are very swift of foot.