300 
BATHYMETRICAL SURVEY OF 
area of about 370 acres, or over half a square mile, and an area twenty 
times greater — an area of over 11 J square miles — drains into it. The 
maximum depth of 71 feet was observed not far from the largest island 
in the loch, and nearer the northern than the southern end. The 
volume of water is estimated at 415 million cubic feet, and the mean 
depth at nearly 26 feet. Loch Fiodhaig was surveyed on October 23, 
1902, but the elevation above the sea was not determined by levelling ; 
judging from the contour-lines, the lake-surface is apparently nearly 
700 feet above sea-level. The loch is irregular both in outline and 
conformation. The lake-floor shows undulations, and in some places 
deep water approaches very close to the shore, as may be seen in the 
two sections on the map. The areas between the contour-lines, and 
the percentages to the total area of the loch, are as follows : — 
0 to 25 feet 203 acrei? 
25 „ 50 „ 133 „ 
Over 50 „ 33 „ 
369 „ 
The temperature of the surface water on the date of the survey was 
48°*0 Fahr. 
Gorm Loch Mdr (see Plate LXIX.). — Gorin Loch Mor lies about 
4 miles to the west of the head of Loch Shin, in a mountainous district, 
with Beilin Leoid (2597 feet) to the north, Beinn Uidhe (2384 feet) to 
the west, and Ben More Assynt (3273 feet) and Coniveall (3234 feet) to 
the south. Its outflow is carried through a series of smaller lochs 
(Fionn Loch Mor, Fionn Loch Beag, and Loch na Sroine Luime), which 
could not be sounded, into the river Cassley. Though a comparatively 
small loch, it has the distinction of being deeper than the other lochs 
in the basin, except Loch Shin. It is very irregular in outline, and 
includes many islands. The length of the loch, along a straight line 
from north-west to south-east, is slightly over a mile ; but along a 
line following the deeper water it is considerably more. The greatest 
width in a north-and-south direction is over half a mile, the mean 
breadth of the entire loch being less than a quarter of a mile. Its 
waters cover an area of about 185 acres, or over a quarter of a square 
mile, and it drains an area of square miles. Nearly 70 soundings 
were taken, the maximum depth of 91 feet being observed comparatively 
close to the western shore. The volume of water is estimated at 196 
million cubic feet, and the mean depth at over 24 feet. The loch was 
surveyed on October 22, 1902, when the elevation of the lake-surface 
was found to be 847*0 feet above the sea ; when visited by the Ordnance 
Survey officers on October 1, 1870, the elevation was 846*4 feet above 
sea-level. 
55 per cent. 
36 „ 
9 „ 
100 
