As related in the passage quoted above, Flinders at first thought he had reached Westernport, though the narrowness of the entrance did not correspond with Bass's description of the harbour he had discovered four years previously. But Baudin had told him that he found no port or harbour of any kind between Westernport and Encounter Bay. Consequently, it was all the more astonishing to behold this great sheet of blue water broadening out to shores overlooked by high hills, and extending northward further than the eye could penetrate. It was not until the following day, April 27th, that he found he was not in the port which his friend had discovered in the whaleboat. Immediately after breakfast he rowed away from the ship in a boat, accompanied by Brown and Westall, to ascend the bluff mountain on the east side which Murray had named Arthur's Seat. From the top he was able to survey the landscape at a height of a thousand feet; and then he saw the waters and islands of Westernport lying beneath him only a few miles further to the east, whilst, to his surprise, the curves of Port Phillip were seen to be so extensive "that even at this elevation its boundary to the northward could not be distinguished." Next morning, April 28th, Flinders commenced to sail round the bay. But the wind was slight and progress was slow; with his fast diminishing store of provisions vexing his mind, he felt that he could not afford the time for a complete survey. Besides, the lead showed many shallows, and there was a constant fear of running the ship aground. He therefore directed Fowler to take the Investigator back to the entrance, whilst, on the 29th, he went with Midshipman Lacy, in a boat provisioned for three days, to make a rapid reconnaissance of as much as could be seen in that time. He rowed north-east nine miles from Arthur's Seat, reaching about the neighbourhood of Mornington. Then he crossed to the western side of the bay, and on the 30th traversed the opening of the arm at the head of which Geelong now stands. At dawn on May 1st he landed with three of the boat's crew, for the purpose of ascending the highest point of the You-yang range, whose conical peaks, standing up purple against the evening sky, had been visible when the ship first entered Port Phillip. "Our way was over a low plain, where the water appeared frequently to lodge. It was covered with small-bladed grass, but almost destitute of wood, and the soil was clayey and shallow. One or two miles before arriving at the feet of the hills, we entered a wood, where an emu and a kangaroo were seen at a distance; and the top of the peak was reached at ten o'clock."