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.