After a slow navigation, during which we made repeated halts, we reached the mouth of the great lake about three in the afternoon. About six miles S. W. of this entrance, there is a rock in the form of a truncated sugarloaf; it is situated in an inundated marsh which is covered with green herbage. This enormous rock, which is quite bare, forms a singular contrast with the freshness of the surrounding vegetation. As it has, though a very striking land-mark, received no name from the natives, I thought proper to give it one, and have named the whole spot St. Charles’s Island. In the lake, and about nine or ten miles to the N. E. is a small island on which I observed some trees almost destitute of leaves. It is capable of being inhabited, and affords facilities for the formation of a good port. I have named it Henry Island, in honour of his Royal Highness the Duke of Bourdeaux. A third island, also formed of rock, is situated between these two, a little to the eastward of the line which would intersect them, and to it I have given the name of Maria-Theresa, in honour of her Royal Highness the Dauphiness. Two of these islands appear to command the mouth of the lake. Were a fort built on one of the three it would command the environs, and the navigation would be under the control of the possessor. To the N. N. E. of the island of Maria-Theresa we observed a hill about fifty or sixty fathoms high. It is composed of red earth, and of large porous rocks of the same colour. Some fishermen have established themselves on the declivity of this hill, which is extremely arid. Land is seen on every side of the lake except on the west, where it spreads out like an inland sea. On coasting along its northern side, and steering nearly W. N. W. to the distance of fifteen miles, we leave on the left a tongue of very flat land, which extends several miles southward. It seems to close the passage of the lake, and to form a kind of strait. Beyond this barrier the lake is prolonged, as I have said, towards the west, until it is lost in the horizon. The barrier I have just mentioned divides lake Debo into two lakes, the upper and the lower. That through which the boats passed, and in which the three islands I have mentioned are situated, is very large. It extends in an easterly direction, and is surrounded by extensive marshes. Land is visible on every side.