THE FRESH- WATER LOCHS OF SCOTLAND. 213 



Loch Eaoinamt (see Plate LXXXIV.) is a small loch about 3 miles 

 north-east of Carloway, on the west coast, on a land surface gently rising 

 towards the south. It is three-quarters of a mile long, from east to west, 

 and a quarter of a mile broad at the extreme west end. It is narrow at 

 the east end, and expands and deepens westward. A very small area, 

 exceeding 50 feet in depth, with the maximum of 01 feet, lies close to the 

 north shore and near the west end ; the mean depth is 20^ feet, the area 

 about 73 acres, and the volume 65 millions of cubic feet. The drainage 

 area is barely half a square mile. The outflow is by a small stream, which, 

 leaving the east end of the loch, flows north past several mills, into Loch 

 na Muilne. The surface was 109*5 feet above sea-level on August 22, 

 1903. The temperature only varied one-fifth of a degree from surface to 

 bottom surface, 55-8 Fahr. ; 54 feet, 55'6. 



Loch Langavat (see Plate LXXXV.). Loch Langavat, the most 

 extensive body of fresh water in the island of Lewis, is centrally situated 

 in the broadest part of the island, between Lochs Seaforth and Erisort on 

 the east, and Lochs Resort and Little Roag on the west. The upper end 

 of the loch lies among hills of over 1500 feet in height. The land falls 

 towards the lower end, which borders on a broad plain, studded with 

 innumerable lochs, stretching for miles to the north and east. In form it 

 is very irregular long and narrow, with undulating shore-line and zigzag 

 axis several constrictions and bends dividing it into distinct basins. The 

 length, in a straight line from south-west to north-east, is 7 J miles ; if the 

 centre line were followed it would be much greater. The maximum 

 breadth is three-quarters of a mile. There are three large basins of over 

 25 feet in depth, besides some smaller depressions. The largest and 

 deepest basin occupies the southern section of the loch, which is 3^ miles 

 long, fully half a mile broad in the centre, and is almost straight. The 

 25-feet contour is parallel with the shore-line, and encloses an area nearly 

 3 miles long. The area enclosed by the 50-feet contour is fully a mile in 

 length, and contains two small areas over 75 feet in depth, with maxima 

 of 97 and 98 feet respectively, separated by an elevation on which the 

 depth is 72 feet. This large basin is separated from the next by a very 

 narrow strait where the depth is only 9 feet. The mid basin is deepest 

 at the south-western end, where the depth of 90 feet occurs, and shallows 

 and contracts towards the north-east. The next bend to the east leads to 

 the third section of the loch, which is as long and broad as the first 

 (85 miles long and three-quarters of a mile broad), but of much more com- 

 plex form, the axis curving, the shore-line much broken up, the contours 

 irregular and interrupted by numerous islands. The largest area of over 

 25 feet is at the south-west end, and has a maximum depth of 40 feet ; 

 smaller areas of greater depth are found further to the north-east. In the 

 last large expansion near the lower end of the loch is a depth of 65 feet. 

 The mean depth is 25 feet, the superficial area 3J square miles, and the 



