Between Augustus and Byam Martin's Islands there is an open strait, of one mile and a half wide; but, its communication with the sea to the north, appears to be little more than half a mile.

BYAM MARTIN'S ISLAND is separated from a range of small islets, extending North-North-East by a strait; and these last are divided from the Champagny Isles by another strait, from twenty-eight to thirty fathoms deep, through which the tide runs with great force.

Off the north end of Byam Martin's Island are several smaller islets and coral reefs; the latter extend from it for more than six miles: the north-westernmost of these islets is the land seen in 1801 by Captain Heywood, and was called by him Vulcan Point: RED ISLAND, which he also saw, is eight miles to the westward; it is in latitude 15 degrees 13 minutes 15 seconds, and longitude 124 degrees 15 minutes 45 seconds: between it and Champagny Isles the ebbing tide uncovered several extensive reefs.

Ten miles North 26 degrees East from Red Island, and South 71 degrees West from Freycinet's Island, is a dry sandbank surrounded by a reef.
DEGERANDO ISLAND, so called by the French, is the southernmost of the CHAMPAGNY ISLES: considerable reefs extend off its south end, which are dry at low water; its centre is in latitude 15 degrees 20 minutes 45 seconds, and longitude 124 degrees 13 minutes 15 seconds.
CAMDEN BAY is formed between Byam Martin's Island and Pratt's Islands, and extends to the eastward to Roger's Strait; it is twelve miles deep and eight wide.

Here the tide rose and fell thirty-seven feet and a half, the moon's age being nineteen days.