At one part the width across to Walmesly Bay cannot be more than a mile and a half.
The MONTALIVET ISLES, about six leagues from the main, consist of three rocky islands; they are visible for six or seven leagues from the deck: the north-easternmost is in latitude 14 degrees 13 minutes 40 seconds, longitude 125 degrees 19 minutes 30 seconds.
MONTAGU SOUND extends from Cape Voltaire to the north end of Bigge's Island, a distance of thirty-one miles, and is from eleven to twenty miles deep.

It is fronted by a range of islands; the outer range, which is eight miles within the Montalivet Isles, was called PRUDHOE ISLANDS; besides which there were several scattered about the sound, and some of larger size near the main: of the latter are KATER'S and WOLLASTON'S.
They are of a very rocky character, and furnished with but a poor and shallow soil, although the surface is thickly covered with small trees, growing most luxuriantly.

WATER ISLAND, to the north-east, in latitude 14 degrees 21 minutes, and longitude 125 degrees 32 minutes 25 seconds, was visited by us, as was also CAPSTAN ISLAND, in the south-west corner of the sound.

The latter island is in latitude 14 degrees 35 minutes 20 seconds, and longitude 125 degrees 16 minutes 20 seconds.

They are both rocky, and destitute of any soil but what is formed by the decomposition of the vegetables that grow upon the island.