The INNER HARBOUR is divided into two basins which extend in for two miles on either side of Middle Head, a cliffy projection, surrounded by a rocky shore for a quarter of a mile off. The anchorage between the entrance and Middle Head is in five and six fathoms mud, and in the centre of the western basin the depth is five fathoms mud. The shores are higher than usual, and are varied by sandy beaches and cliffs, some of white and others of a red colour. The western side of the port was not visited, and our tracks and examinations were made principally on the opposite shore. At the bottom of Knocker's Bay is a shoal mangrove opening, of no importance. See volume 1. POINT SMITH is in latitude 11 degrees 6 minutes 45 seconds, and longitude 132 degrees 12 minutes 30 seconds. VASHON HEAD has a considerable shoal projecting from it, and extending into the bay to the westward which was called TREPANG BAY. This bay has an opening at the bottom, that appeared to be shoal. A small sandy island lies at the distance of a mile and three-quarters from the shore; the reef projects into the sea for nearly a mile farther, and apparently extends to the South-West to the north head of POPHAM BAY, which has a small opening at the bottom, but of shoal approach; good anchorage may be had in Popham Bay in five and six fathoms, a little within the heads, and as they bear North and South-South-West, it is well sheltered in the easterly monsoon. Hence to CAPE DON is three miles and a half. The latter cape is in latitude 11 degrees 19 minutes 30 seconds, and longitude 131 degrees 45 minutes 30 seconds. VAN DIEMEN'S GULF is seventy miles deep, and more than forty broad. It has two outlets to sea; the one to the northward, DUNDAS STRAIT, is sixteen miles wide and very deep; the other, CLARENCE STRAIT, is seventeen miles wide, and communicates with the sea round the south sides of Melville and Bathurst Islands: it is probably not so safe as Dundas' Strait, on account of Vernon's Isles, which lie in mid channel, near its western end. The north eastern side of Van Diemen's Gulf washes the south side of Coburg Peninsula. It has several bays, and, to the eastward of MOUNTS BEDWELL and Roe, the shore is fronted by SIR GEORGE HOPE'S ISLANDS, forming a channel or port within them twenty miles deep and from three to six broad; the entrance to it is round the north end of GREENHILL ISLAND, which is separated from the land of the peninsula, by a strait a mile and a half wide: the depth in mid-channel, for the shore on either side for half a mile is shoal and rocky, is eighteen fathoms, and within it the bottom is six, seven, and eight fathoms deep, and principally of mud. This strait is in latitude 11 degrees 35 minutes.