6 
BATHYMETKICAL SURVEY OF 
of about 120 acres, and receiving tbe drainage from an area of three 
quarters of a square mile. Its superfluent water is carried by a short 
stream into the neighbouring Loch Leum a’ Chlamhain, lying less than 
a quarter of a mile to the east. The maximum depth of 33 feet was 
observed comparatively close to the south-eastern shore. The volume 
of water is estimated at 60 million cubic feet, and the mean depth at 
llj feet. The loch was surveyed on October 20, 1902, but the elevation 
above the sea could not be determined ; when visited by the officers of 
the Ordnance Survey on June 10, 1870, the elevation was found to be 
800*5 feet above sea-level. 
Loch Coire nam Meann forms a simple basin, but the north-western 
portion is comparatively shallow, the deeper water occurring in the south- 
eastern portion, the deepest sounding having been recorded less than 200 
yards from that shore. The deep water, however, is of limited extent, for 
only 15 per cent, of the lake-floor is covered by more than 20 feet of 
water, while about one half of the lake-bottom is covered by less than 10 
feet of water, as shown in the following table : — 
Feet. 
Acres. 
Per cent. 
OtolO 
58 
49 
10 „ 20 
43 
36 
over 20 
18 
15 
119 
100 
The temperature of the surface water at 3 p.m. on October 20, 1902, 
was 45°*0 Fahr. 
Loch Leum a’ Chlamhain (see Plate II.). — Loch Leum a’ Chlamhain (or 
(Leum-na-Clavan, or Leum-a-Chamblain) is a fine fishing loch, like its 
neighbour Loch Coire nam Meann, famous for the large size of its trout 
and for the heavy baskets frequently recorded; like its neighbour also 
it is strictly preserved. Ben Griam Mhor lies to the south, and Ben 
Griam Bheag to the east. The outflowing water is carried by the Allt 
Airidh-dhamh into Loch Araich-Lin. The loch trends nearly north and 
south, and is If miles in length. It varies greatly in width, with a 
constriction in the central part, the maximum breadth exceeding half a 
mile towards the northern end of the loch, the mean breadth being one- 
third of a mile. Its waters cover an area of about 350 acres, or over half 
a square mile, and it drains directly an area of nearly four square miles, 
but since it receives the outflow from Loch Coire nam Meann its total 
drainage area is about 4| square miles. The maximum depth of 51 feet 
was observed near the southern end of the loch, while towards the 
northern end a depth of 50 feet was recorded. The volume of water 
is estimated at 298 million cubic feet, and the mean depth at 19i feet. 
The loch was surveyed on October 20, 1902, but the elevation above the 
sea could not be determined ; when levelled by the Ordnance Survey 
