They were glad, indeed, when at last they saw the broad sheet of Lake Baikal. They had for some time been bearing to the north of west, and struck the lake some twenty miles from its head. There were a good many small settlements round the lake, a good deal of fishing being carried on upon it, although the work was dangerous, for terrible storms frequently swept down from the northern mountains and sent the boats flying into port. The lake is one of the deepest in the world, soundings in many places being over five thousand feet. Many rivers run into the lake, the only outflow being by the Angara. Baikal is peculiar as being the only fresh-water lake in the world where seals are found, about two thousand being killed annually. The shores are in most places extremely steep, precipices rising a thousand feet sheer up from the edge of the water, with soundings of a hundred and fifty fathoms a few yards from their feet. Fish abound in the lake, and sturgeon of large size are captured there. Godfrey knew that there were guard-houses with Cossacks on the road between the northern point of water and the steep mountains that rise almost directly from it. He had specially studied the geography of this region, and knew that after passing round the head of the lake there was a track across the hills by which they would, after travelling a hundred and fifty miles, strike the main road from Irkutsk to Yakutsk, near the town of Kirensk, on the river Lena. From Kirensk it would be but little more than a hundred miles to the nearest point on the Angara, which is one of the principal branches of the Yenesei. To gain this river would be a great point. The Lena, which was even nearer to the head of Lake Baikal, also flowed into the Arctic Sea; but its course was almost due north, and it would be absolutely hopeless to endeavour to traverse the whole of the north coast of Siberia. The Angara and the Yenesei, on the other hand, flowed north-west, and fell into the Arctic Sea near the western boundary of Siberia, and when they reached that point they would be but a short distance from Russia. It seemed to him that the only chance was by keeping by a river. In the great ranges of mountains in the north of Siberia there would be no means of obtaining food, and to cross such a district would be certain death. By the rivers, on the other hand, there would at least be no fear of losing their way. The journey could be shortened by using a canoe if they could obtain one, and if not, a raft. They would often find little native villages or huts by the banks, and would be able to obtain fish from them. Besides, they could themselves catch fish, and might possibly even winter in some native village. For all these reasons he had determined on making for the Angara.