Mount Trafalgar is a conspicuous object on the north-eastern side of the basin; and another hill close to it being equally remarkable was called Mount Waterloo. These two hills rise precipitously from the plain; and being capped by a wall-like battlement bear a strong resemblance to Steep Head in Port Warrender. Upon leaving the cutter we crossed St. George's Basin which appeared to receive several streams on the south side and landed on a small wooded islet for bearings; from which the summits of Mounts Waterloo and Trafalgar bore in a line. About two miles farther on the banks of the river again contracted and trended to the south-east on so direct a course that, from the distant land being hidden by the horizon, the river bore the appearance of being a strait. We were now twenty-two miles from the sea and as there was every appearance of this proving a considerable stream it was honoured by the title of Prince Regent. While I was employed upon the island with the theodolite Mr. Hunter, my companion, shot seven or eight brace of birds: they were of two kinds; one a species of oyster-catcher and the other a sandpiper. The island is of small extent and is connected to the land by a shoal communication; it is rocky and thickly wooded; the trees were chiefly acacias. The marks of considerable floods were noticed upon its shores; and the wrecks of very large trees were thrown up ten or twelve feet above the high-water mark. We re-embarked at a quarter to twelve o'clock and pulled fourteen miles farther up the river when a slight turn hid the island on which we had landed from our view; from the width of a mile and a half at the entrance it had decreased to about two-thirds of a mile and still continued gradually to get narrower: its banks throughout are bounded by steep rocky hills rising to the height of two or three hundred feet which, in some parts, were nearly overhanging the water; several mangrove-inlets communicated with the river on either side but they were all salt-water creeks. The rocks on the hills are formed of a close-grained siliceous sandstone; and the ground is covered with loose masses of the same rock, with spinifex growing between them; this plant is of itself sufficient to indicate the poverty of the soil. As we passed a small round islet an alligator which had been basking in the sun alarmed at our approach, rushed into the water, and, as we came near the spot, rose to reconnoitre us, but instantly sunk again. The sea-breeze being unimpeded by the intervention of land blew so strong that, when the flood ceased, we were enabled to proceed for some time against the ebb-tide. It also prevented our suffering from the heat which would otherwise have been very oppressive for the thermometer stood all day at 96 and 98 degrees.