406 BATHYMETRICAL SURVEY OF 



south and east, and the outflowing stream goes half a mile north into 

 Loch Ness. On April 23, 1903, the loch was 577*8 feet above sea-level; 

 on August 4, 1869, the Ordnance Survey officers found it to be 577*4 

 feet. 



The bottom is flat, with a central depth of 41 feet. The 25-feet 

 contour closely follows the shore, but does not go into the north arm, 

 in which there is an isolated sounding of 25 feet. The maximum of 

 51 feet occurs in a little hole close to the shore, in the south-east corner 

 of the loch, the mean depth being 26J feet. 



Temperature of the surface, 42-0 Fahr. ; at 25 feet, 42'0 ; at 50 

 feet, 41;8. 



Loch nan Eun (see Plate CHI.). A dark and desolate tarn lying at 

 the foot of the wild and bare Cairn Vangie. The loch lies in a deep 

 valley, and a boat was with difficulty transported down the steep hill 

 from the road. Glen nan Eun runs here nearly east and west. The 

 Cumrack burn flowing out from the loch runs to the north-east and 

 becomes the river Foyers. The surface is about 915 feet above the sea. 

 The length is barely half a mile, and the greatest breadth about one- 

 sixth of a mile. The superficial area is about 35 acres, and the contents 

 15 millions of cubic feet. The drainage area is nearly 4 square miles, 

 and the chief feeder is the nan Eun, coming from the south-west. 



Loch nan Eun is somewhat oblong, and is a simple basin of no great 

 depth. The slope of the bottom is steeper on the south, and very gentle 

 on the north. The maximum depth of 21 feet is near the south shore; 

 the mean depth is 10 feet. 



On April 25, 1903, the temperature at the surface was 42-5 Fahr., 

 and at 20 feet, 42'l. 



Loch Killin (see Plate CHI.). Loch Killiii lies high up among the 

 mountains on the east side of Loch Ness, about 10 miles east of Fort 

 Augustus. It is a narrow loch of moderate size, the valley which it 

 occupies running at that part nearly south to north. On the west the 

 precipitous crags of Creag Acain rise abruptly from the shore of the 

 loch to a height of 1000 feet above its surface. Equally high hills rise 

 more gradually on the east (see Fig. 64). 



Loch Killin is narrow to the north and broadens to the south, the 

 maximum breadth of a quarter of a mile being just a quarter of a mile 

 from the south end. The mean breadth is about one-sixth of a mile. 

 The length is considerably over a mile. The loch has a superficial area 

 of about 130 acres, and contains 137 millions of cubic feet of water. 

 Loch Killin has a large drainage area, extending to 38J square miles, 

 the river Killin, which enters on the south, bringing the drainage of 

 several large glens. The river flowing out to the north is called the 

 Fechlin, and is one of the chief sources of the river Foyers. At the 



