The channels on either side of Adolphus Island are called the East and West Arms. The East Arm is from one to two miles and a half wide, and four or five fathoms deep. At ten miles it is joined by an arm that washes the south side of Adolphus Island, and the united streams trend together in a South-East direction, under the foot of Mount Connexion, for a considerable distance. This inlet was not examined. The West Arm extends down the west side of Adolphus Island for seven miles; it is then divided by a projecting point under View Hill; and, whilst one runs to the eastward and unites with the East Arm, the other continues to trend to the southward, and then opens out to an extensive basin eleven miles in length, and from four to six in breadth; and, at seven miles, gradually contracts as it winds under the base of the Bastion Hills: before, however, you arrive at the basin, the stream is divided by several islands and rocky islets, that narrow the channel in some parts to the width of half a mile, in which the depth is very great, and the tide runs with great strength. At the entrance of the basin the high rocky character of the west shore is superseded by low mangrove banks, with here and there a detached hill rising from a plain of low marshy land, that, at the time of our visit, was covered with a salt incrustation, occasioned by the evaporation of the sea, which, apparently, had lately flooded the low lands to a great extent: some of these plains are seven and eight miles in diameter. The hills rise abruptly; those we examined are of sandstone formation. The basin is very shoal, but there is a narrow channel in the centre, with from five to nine fathoms water. The shore, opposite the Bastion Hills, is low, and the gulf trends gradually round to the South-West for five miles, when it is contracted into a narrow communication, called The Gut, leading to an interior shoal basin, strewed with low marshy islands, which the tide covers. This basin terminates to the southward in a narrow stream, winding under the base of Mount Cockburn; and there also appeared to be several others falling into the basin more to the westward. The water was salt at the extremity of our exploration. The Gut leading to it is two miles long, and not so much as a quarter of a mile wide: in some parts we had nineteen fathoms, but in others it was deeper; it runs through a chasm in the hills, which rise abruptly, and occasionally recede and form bights, in which, in the wet season, the rains form some very considerable mountain torrents. No fresh water was seen in any part of the gulf; but as it was near the end of the dry season when we were there, it might probably be found in a more advanced season in every part of the western side, where the land is high and the gullies numerous: there is, however, no durable freshwater stream without the Gut. An alligator was observed swimming about, but very few fish were noticed.