THE FRESH-WATER LOCHS OF SCOTLAND. 
187 
Surface ... 
15 feet . . . 
25 „ ... 
35 „ ... 
61°-0 Fahr. 
54°*4 „ 
52^-8 „ 
52°*5 „ 
Loch Huna (see Plate LXXI.). — The uppermost loch of the Scadavay 
basin, and the highest, being 21 ’6 feet above sea-level. In outline it is less 
irregular than most Uist lochs, and somewhat resembles Loch Hunder in 
form. It is nearly a mile long and half a mile broad. The bottom is very 
uneven, and there are many small islands. On one of the largest there is 
a Dun, and a long causeway leads to the west shore. The loch is on the 
whole very shallow. There is a hole 23 feet deep in the northern part, 
and another, with the maximum depth of 25 feet, in the southern part. 
Many boulders are scattered around, as well as in, the loch. The shores 
are partly of rock, partly of mounds of gravel. 
On May 31, 1904, there was a difference of between the surface and 
bottom temperatures : — 
Surface ... 
5 feet . . . 
10 „ ... 
20 „ ... 
64°-0 Fahr. 
61°-0 „ 
60°-0 „ 
57°-5 „ 
Loch na MoracJia (see Plate LXXI.). — A loch of somewhat simple 
form, draining, through a barrier a few yards wide, into Loch nan Eun. 
From the north end three narrow inlets diverge to north and east and 
west. In these are some islands. The body of the loch has no islands 
except close inshore, and is a simple basin. The 10-feet contour follows 
the outline, but is closer to the shore on the north-east, showing that the 
slope is steeper there. Within are two depressions: 19 feet near the 
north end, and 20 feet near the south-east corner. The greater part of the 
shore is of rock. The temperature on May 11, 1904, was nearly uniform 
throughout, viz. 49°*2 Fahr. at the surface, and 49°‘0 at 15 feet. 
Loch nan Eun (see Plate LXXI.). — In length Loch nan Eun is 
exceeded only by Loch Obisary and Loch Scadavay. Many lochs exceed 
it in area and volume. It is a narrow loch, running from west to east, 
and measures 21 miles in length, by half a mile in greatest breadth. 
As the centre of the loch at the broadest part is occupied by a large 
island, Eilean Buidhe, half a mile long, there is no breadth of open water 
anywhere. The mean depth is only 8 feet, and, as in Loch Scadavay, the 
deeper soundings, 31 feet, 26 feet, 24 feet, etc., were obtained in isolated 
holes. The superficial area is half a square mile, and the volume of water 
114 millions of cubic feet. The loch drains an area of 4 square miles, 
which includes Lochs Huna and na Moracha. Besides Eilean Buidhe 
there are many smaller islands, and innumerable stones obstruct the 
channel, especially in the western part and to the south of Eilean Buidhe, 
where it is difficult to get about in a boat. 
