They are situated between the latitude of 16° 10' and 16° 55' S. and between the longitude of 150° 57' and 152° W. from the meridian of Greenwich. Ulietea and Otaha lie within about two miles of each other, and are both inclosed within one reef of coral rocks, so that there is no passage for shipping between them. This reef forms several excellent harbours; the entrances into them, indeed, are but narrow, yet when a ship is once in, nothing can hurt her. The harbours on the east side have been described already; and on the west side of Ulietea, which is the largest of the two, there are three. The northermost, in which we lay, is called _Ohamaneno_: The channel leading into it is about a quarter of a mile wide, and lies between two low sandy islands, which are the northermost on this side; between, or just within the two islands, there is good anchorage in twenty-eight fathom, soft ground. This harbour, though small, is preferable to the others, because it is situated in the most fertile part of the islands, and where fresh water is easily to be got. The other two harbours lie to the southward of this, and not far from the south end of the island: In both of them there is good anchorage, with ten, twelve, and fourteen fathom. They are easily known by three small woody islands at their entrance. The southermost of these two harbours lies within, and to the southward of the southermost of these islands, and the other lies between the two northermost. I was told that there were more harbours at the south end of this island, but I did not examine whether the report was true. Otaha affords two very good harbours, one on the east side, and the other on the west. That on the east side is called Ohamene, and has been mentioned already; the other is called _Oherurua_, and lies about the middle of the south-west side of the island; it is pretty large and affords good anchorage in twenty and twenty-five fathom, nor is there any want of fresh water. The breach in the reef, that forms a channel into this harbour, is about a quarter of a mile broad, and, like all the rest, is very steep on both sides; in general there is no danger here but what is visible. The island of Bolabola lies N.W. and by W. from Otaha, distant about four leagues; it is surrounded by a reef of rocks, and several small islands, in compass together about eight leagues. I was told, that on the south-west side of the island there is a channel through the reef into a very good harbour, but I did not think it worth while to examine it, for the reasons that have been just assigned. This island is rendered very remarkable by a high craggy hill, which appears to be almost perpendicular, and terminates at the top in two peaks, one higher than the other.