While the ship's company were employed in lightening the ship, and the carpenters were cutting down timber for riders and plank, I determined, before any thing material in the repairs was set about, to go round and make a survey of Broken-Bay: in this excursion I was accompanied by several gentlemen of the settlement; the boats were dispatched round, under the care of Lieutenant Bradley, by whom, and Lieutenant Ball, of the Supply, I was assisted in this work: the party went by land, but as I wished also to make a sketch of the coast between the two harbours, we determined to be two days on the journey, and to lye all night in the woods. After taking a sketch of the coast, we arrived at Pitt-Water, and joined the boats in the afternoon of the second day. We visited all those parts, which are navigable for shipping, and having before very particularly sounded and examined all the branches here, the business was finished in little more than a fortnight. Mr. Bradley returned with the boats, and we walked along shore to Port Jackson. The entrance of Broken-Bay lies in latitude 33 deg. 34' south, and longitude 151 deg. 27' east; the bay is large and clear; the distance from north to south head, is two miles, and the depth is eight, ten, and twelve fathoms; but as you run up the bay it shoals to six, seven, and five fathoms. Just within the north head of the bay is the entrance of the northern branch, which, from the shoalness of the water, is only navigable for boats, or small vessels; the channel going in is very narrow, occasioned by a long spit of sand, which extends from a low sandy point on the west side of the entrance, and on which, when the wind is from the eastward, the sea breaks very high. A little within the south head of the bay is the entrance of the Southern Branch or Pitt-Water; this is a good harbour, though the entrance is rendered rather narrow by a shoal bank, which extends from the eastern point full two-thirds across; keep the west shore on board, which is pretty bold, and is a high, steep, rocky point, and steer right up the branch; three fathoms is the most you will have at low water, and that depth is only in the narrows, which are of very short extent, for as you run up, you very soon deepen to four, five, six, and eight fathoms; to the shoal which narrows the entrance, it is very gradual soundings. When you are above the second point on the west shore, you have good depth of water and good room; you may run up in mid-channel without fear; both shores are pretty bold to, except off the points, from some of which it is shoal a small distance: in this branch there are several coves, in which a ship might lighten and careen; there is also fresh water in various parts of this harbour, with wood in abundance, and fish may be caught in all the sandy bays.