154 
BATHYMETRICAL SURVEY OF 
bearing the outflow from Loch na Gainimh in the Canisp forest. The 
ground around the loch is low. It is three-quarters of a mile in length, 
and a quarter of a mile in maximum breadth, the mean breadth being 
one-sixth of a mile. Its waters cover an area of about 79 acres, and it 
drains an area 105 times greater — an area of nearly 13 square miles. 
Seventy-five soundings were taken, the maximum depth observed being 
31 feet. The volume of water is estimated at 35,408,000 cubic feet, and 
the mean depth at over 10 feet. Loch Druim Suardalain is irregular in 
outline, with a few islands, and the conformation of the bottom is 
peculiar. Towards the eastern end is a small area exceeding 20 feet in 
depth, the deepest sounding in this position being 29 feet, but the 
maximum depth of the loch (31 feet) was observed quite close to 
the south-western shore, apparently a deep hole surrounded by much 
shallower water. The area of the lake-floor covered by less than 10 
feet of water is about 45 acres, or 58 per cent, of the total area of the 
loch. The loch was surveyed on September 15, 1902, and the elevation 
•above the sea was determined, by levelling from bench-mark, as being 
134-5 feet; when levelled by the officers of the Ordnance Survey on 
September 19, 1871, the elevation was found to be 133-1 feet above sea- 
level. The temperature of the water was found to be uniform at 53°-2. 
Loch na Doire Daraich (see Plate XXXVI.). — Loch na Loire 
Uaraich (or Loch Culag, as it is more generally called in the district) 
is situated about a quarter of a mile to the south-east of Loch Inver, 
into which it flows by the Amhainn na Culeig ; its chief supply of water 
is derived from Loch Druim Suardalain. The surrounding ground is 
low, but is steeper to the south and south-west, and on the western side 
thickly wooded. It is very irregular in outline and conformation, and 
the two arms projecting southwards are to a large extent filled with 
weeds. The length from south-west to north-east is half a mile, and the 
maximum breadth a quarter of a mile, the mean breadth being one- 
seventh of a mile. Its waters cover an area of about 44 acres, and it 
drains directly an area exceeding a square mile, but since it receives the 
outflow from Loch Druim Suardalain, its total drainage area is about 
14 square miles, an area 203 times greater than that of the loch. Over 
40 soundings were taken, the maximum depth observed being 9 feet: 
The volume of water is estimated at 6,922,000 cubic feet, and the mean 
depth at 3J feet. The loch is very shallow, but it is curious to note that 
the deeper soundings were taken near shore ; soundings of 5 and 6 feet 
were recorded in four places close to the shore, an isolated sounding of 
7 feet was taken at the entrance of the inflowing burn from Loch Druim 
Suardalain, while the maximum depth of the loch was observed close to 
the large promontory on the western shore. Loch na Doire Daraich 
was surveyed on September 20, 1902, the elevation of the lake-surface 
being 72-5 feet above the sea; when levelled by the officers of the 
