These rivers have been described in the narrative.

See volume 1.

The bottom of the gulf is very low, and forms two bights, separated by a point that projects for seven or eight miles.
In the neighbourhood of the rivers the country is sprinkled with wooded hills, that extend in a straggling chain towards Wellington Range, of which they might be considered a part: but between the rivers and Clarence Strait the country is low and flat, and only protected from inroads of the sea by a barrier of sandhills, beyond which not a vestige of the interior could be seen.
CLARENCE STRAIT separates Bathurst and Melville Islands from the mainland: it is seventy-five miles long, and from seventeen to thirty-five wide.

The narrowest part is at about its centre, between Cape Gambier and Cape Eldon, and in this space is a group of four low rocky islands, covered with mangroves (Vernon's Islands) from which considerable reefs extend towards either shore.
The best channel is probably on the northern side, near Cape Gambier, which is in latitude 11 degrees 56 minutes 20 seconds; and there also appeared to be a wide and safe channel on the south side; but the neighbourhood of Vernon's Islands is rocky.

The flood-tide sets to the eastward into the gulf.
MELVILLE ISLAND is of considerable size, and forms the western side of Van Diemen's Gulf; its greatest length from Cape Van Diemen to Cape Keith being seventy-two miles, and its greatest breadth thirty-eight miles; its circumference is two hundred miles.
We did not land on any part of it, excepting in the entrance of Apsley Strait, at Luxmoore Head (latitude 11 degrees 21 minutes, longitude 130 degrees 22 minutes) from which we were driven by the natives.