On the 6th of June, 1789, Governor Phillip, accompanied by a large party in two boats, proceeded to Broken Bay. After spending some time without result, they pulled into an inlet, and suddenly found themselves at the entrance of a fresh-water river, up which they rowed twenty miles in a westerly direction, but provisions failing, they turned back. A second expedition was then undertaken, and this time the boats penetrated between sixty and seventy miles, inclusive of the windings of the river. Further progress was stayed by a fall. The party examined the surrounding country, but opinions differed greatly as to its value; some reporting rich and beautiful land, others low-lying flats subject to floods. A hill close by the fall was ascended, and christened Richmond Hill, and the river was named the Hawkesbury. On the 26th of the same month, Captain Tench, then in charge of the newly-formed outpost of Rose Hill, started on an expedition to the westward. He was accompanied by Mr. Arndell, assistant-surgeon of the settlement, Mr. Lowes, surgeon's mate of the SIRIUS, two marines, and a convict. His relation of his trip is interesting, as being the earliest record of land exploration, and also as containing the account of the discovery of the Nepean River. An extract from his journal runs as follows:-- "I left the redoubt at daybreak, pointing our march to a hill distant five miles, in a westerly or inland direction, which commands a view of the great chain of mountains called the Caermarthen Hills, extending from north to south farther than the eye can reach. Here we paused, surveying 'the wild abyss, pondering over our voyage.' Before us lay the trackless, immeasurable desert in awful silence. At length, after consultation, we determined to steer west and by north by compass, the make of the land indicating the existence of a river. We continued to march all day through a country untrodden before by an European foot. Save that a melancholy crow now and then flew croaking overhead, or a kangaroo was seen to bound at a distance, the picture of solitude was complete and undisturbed. At four o'clock in the afternoon we halted near a small pond of water, where we took up our residence for the night, lighted a fire, and prepared to cook our supper-that was to broil over a couple of ramrods a few slices of salt pork, and a crow which we had shot. At daylight we renewed our peregrination, and in an hour after, we found ourselves on the banks of a river nearly as broad as the Thames at Putney, and apparently of great depth, the current running very slowly in a northerly direction. Vast flocks of wild ducks were swimming in the stream, but, after being once fired at, they grew so shy that we could not get near them a second time. Nothing is more certain than that the sound of a gun had never before been heard within many a mile of this spot." A short description of the hunting practices of the natives here follows, and the explorer then continues:--