PRINCE REGENT’S RIVER is, without exception, the most remarkable feature of the North-West Coast.  In general the inlets of this coast form extensive ports at their entrance; and, when they begin to assume the character of a river, their course becomes tortuous, and very irregular; of which there cannot be a better instance than the neighbouring river, Roe’s River.  Prince Regent’s River trends into the interior in a South-East by East direction for fifty-four miles.  With scarcely a point to intercept the view, after being thirteen miles within it.  The entrance is formed by Cape Wellington on the east, and High Bluff on the west, a width of eight miles, but is so much contracted by islands, that, in hauling round Cape Wellington, the width is suddenly reduced to little more than a mile:  at the branching off of Rothsay Water, it is little more than half a mile, and also the same width at the entrance of St. George’s Basin.  In this space, however, it is in some parts a little wider, but in no part between projecting points is it more than one mile and a quarter.  For the first nine miles the stream is narrowed by islands; beyond this, its boundaries are formed by the natural banks of the river.  On the eastern side, within Cape Wellington, is a deep bay, but of shoal and rocky appearance.  At six miles farther on are two inlets, ROTHSAY and MUNSTER WATERS, near which the tide forms rapid eddies and whirlpools, that render its approach dangerous.  In mid-channel is a group of isles; and, off the easternmost, a reef projects to the eastward for more than half a mile, round which a vessel must pass; here the channel is not more than half a mile wide.  Munster Water, on the western side, communicates with Hanover Bay by a narrow strait, with very good anchorage in it in four and five fathoms mud; it is, however, an inconvenient place to go to, if a vessel is bound any farther up the river.  Rothsay Water is a very considerable arm; and was conjectured to communicate with Prince Frederic’s Harbour, and, if so, would insulate the land between Capes Torrens and Wellington.  We did not enter Rothsay Water; and the tides and whirlpools were too rapid and dangerous to trust our small boats without running a very great risk.  At the entrance of this arm, on the south shore, there appeared to be a shoal-bank.  Halfway Bay offers very good anchorage out of the strength of the tides, with abundance of room to get underweigh from.  The northernmost point of the bay, SIGHT POINT, has a small islet off it (LAMMAS ISLET) where the observations were taken to fix the longitude of Careening Bay. (See above.) The two bays on the opposite, or north-east shore, are shoal, and not fit for any vessel drawing more than six or seven feet; and the shores are so lined with mangroves, as in most parts to defy all attempts at landing.  After passing them, the shores approach each other within three-quarters of a mile, but the south-west shore is fronted by a rocky shoal, which narrows it to less than half a mile; here