To obtain a proper line for the canal upon the south-east side of the river Oich, the channel of that river has been somewhat altered. Loch Oich, which forms the summit-level of this navigation, is about 3¾ miles long, and on an average a quarter of a mile broad. In one place in the middle, and at both ends, it had to be deepened by dredging. The water which falls into this lake, particularly from the river Garry, affords at all times an ample supply for the canal. Between Loch Oich and the next lake in the line, Loch Lochy, there is no natural communication. The interval is about 1¾ miles, and rises 20 feet above the Loch Oich, which, with the depth of the canal, required a cutting of 35 feet. Loch Lochy, which was 21 feet 9 inches lower than Loch Oich, has been raised about 12 feet by an embankment to avoid rock-cutting, and the canal descends to it 9 feet 9 inches by two locks, one of which is also a regulating, or guard lock. Loch Lochy is 10 miles long, and averages one in breadth. In some places it is 76 fathoms in depth. About half a mile of the course of the river Lochy had to be shifted into a new bed to make room for the canal, which, now in its last stage, proceeds from the lake for 8 miles along the north-west bank of that river over a rugged surface to the shore of Loch Eil, which is the more inland part of the Firth, called Loch Linnhe. A little south of Loch Lochy there is a regulating lock; and about a mile from Loch Eil there are eight connected locks, called Neptune’s Stairs, by which the canal descends 64 feet. At Corpach shore it falls 15 feet by two locks, and, after expanding into a basin 250 yards long and 100 broad, it finally descends 7 feet 9 inches by the sea-lock into Loch Eil near Fort William. The entire length of this navigation is 60½ miles, and that of the artificial part, including Loch Doughfour, is 23 miles. There are in all twenty-eight locks. This canal has, as yet, been a most unprofitable speculation, not even paying the expense of its maintenance.