66 
BATHYMETRICAL SURVEY OF 
an inde2)endent stream, the Rannoch river. The fishings in these lochs 
are strictly preserved. 
Loch Loire nam Mart (see Plate XXV.). — Loch Loire nam Alart (or 
Lurinemart, or Durinemast) lies about miles north-west of Loch Aline. 
It trends in a north-west and south-east direction, and is nearly two-thirds 
of a mile in length, the maximum breadth exceeding a quarter of a mile. 
Its waters cover an area of about 72 acres, and the area draining into it 
exceeds 2 square miles. The maximum depth of 48 feet occupies a 
central j^osition, but rather nearer the northern than the southern end. 
The volume of water is estimated at 67 million cubic feet, and the mean 
depth at over 21 feet. The loch was surveyed on August 18, 1904, when 
the elevation was found to be 37*2 feet above the sea; the Ordnance 
Survey officers found the elevation to be 30*6 feet above sea-level on 
Alarch 16, 1867. The loch is simjHe in conformation, about 57 per cent, 
of the lake-floor being covered by less than 20 feet of water. 
Loch Arienas (see Plate XXV.). — Loch Arienas (or Ari-Innes) lies 
about 2 miles north of Loch Aline, and trends in a west-north-west and 
east-south-east direction, being widest in the central part, and narrowing 
towards both ends. It is nearly 2 miles in length, with a maximum 
breadth of three-quarters of a mile, the mean breadth being about one- 
third of a mile. The shore-line is regular on the northern side, except for 
the projecting delta at the mouth of the Arienas burn, the southern shore 
being more irregular. The loch covers an area of about 420 acres, or two- 
thirds of a square mile, and the area draining into it exceeds 8 square 
miles, including that draining into Loch Loire nam Mart. The maximum 
depth of 116 feet was found almost in the centre of the loch. The volume 
of water is estimated at 1035 millions of cubic feet, and the mean depth at 
56 J feet. The loch was surveyed on August 18 and 19, 1904, when the 
elevation was 31*3 feet above the sea; on March 4, 1867, the Ordnance 
Survey officers found the elevation to be 36*0 feet above sea-level, or 
nearly 5 feet higher than in 1904. Thus in March, 1867, Loch Loire 
nam Mart was only half a foot higher than Loch Arienas, whereas in 
August, 1904, it was about 6 feet higher. 
Loch Arienas forms a simple basin, the contour-lines coinciding 
approximately with the outline, but approaching closer to the northern 
shore, where the slope is steepest. The following table, giving the areas 
between the contour-lines, indicates the flat-bottomed character of the 
basin 
Feet. 
Acres. 
Per cent. 
Oto 25 ... 
110 
26-1 
25 „ 50 ... 
• •• 
85 
20-2 
60 „ 75 ... 
78 
18-6 
75 „ 100 ... 
77 
18-5 
Over 100 
70 
16-6 
420 
100-0 
