THE FRESH-WATER LOCHS OF SCOTLAND. 311 
rather shallow, since 70 per cent, of the lake-floor is covered by less 
than 25 feet of water: — 
0 to 25 feet 
25,, 50 „ 
Over 50 ,, 
388 acres 70 per cent. 
149 ,, 
27 
18 „ 
3 
555 „ 
100 
The temperature of the surface water at 10 a.m. on the date of the 
survey was 53°'0 Fahr. The deposits brought up were all very dark 
(black) muds. 
Loch Naver (see Plate LXXII.). — Loch Naver lies about 5 miles to 
the south-east of Loch na Meide, with Ben Klibreck to the south rising 
gently up from the shore of the loch. Altnaharra Inn, at the west end 
of the loch, is a well-known rendezvous for anglers. On the northern 
shore Reidhachaisteil and Gruamamor, and on the southern shore 
Ruighnasealbhaig, are the remains of considerable villages destroyed 
at the beginning of last century when the crofters were turned out. 
There are the ruins of Pictish towers near Gruamamor and on the 
island close to the opposite (southern) shore, and the remains of several 
artificial crannogs rise towards the surface of the water, in one case 
reaching above the surface. Loch Naver is broadly sinuous in outline, 
the general trend being east-north-east and west-south-west, while the 
upper portion for about a mile runs east and west, and it exceeds 6 
miles in length. It is a comparatively narrow loch, the maximum 
width towards the west end not exceeding two-thirds of a mile, whence 
the width gradually diminishes towards the east end, the mean breadth 
of the entire loch being about one-third of a mile, or 6 per cent, of the 
length. Its waters cover an area of about 1446 acres, or 2J square 
miles, and it drains directly an area of nearly 81 square miles; but 
since it receives the outflow from Loch na Meide, its total drainage 
area is nearly 89 square miles. The maximum depth of 108 feet was 
observed in the wider part of the loch about a mile from the west end. 
The volume of water contained in the loch is estimated at 2461 millions 
of cubic feet, and the mean depth at 39 feet. The loch was surveyed 
on September 24 and 25, 1902, when the elevation of the lake-surface 
was determined, by levelling from bench-marks, as being 247'6 feet 
above the sea ; when visited by the officers of the Ordnance Survey on 
June 24, 1870, the elevation was found to be 246-9 feet above sea-level. 
The highest drift-mark observed was 4J feet above the surface of the 
water at the time of the survey, and it was said that the water might 
fall to the extent of 4 feet, giving a range in level of about 8J feet. 
The floor of Loch Naver is rather irregular, as may be seen in the 
longitudinal section taken along the axis of maximum depth, which 
