216 BATHYMETRICAL SURVEY OF 



below the surface of Loch Maree, whilst the distance between the two 

 100-feet contour-lines at this place is 120 yards, and that between the 

 two 150-feet contours is 550 yards. 



The shallow water to the north of the islands is much more remark- 

 able. A large part of this area is under 50 feet in depth, and the 

 deepest water that occurs anywhere between Creag Tharbh and Rudha 

 Chailleach is 79 feet, though it is along this northern channel that the 

 great fault must run. Right in the middle of the channel, underneath 

 Creag Tarbh, the water is only 41 feet in depth ; the hills on the north 

 shore rise steeply up to heights of over 2000 feet in places, and the 

 slope up to the 1000-feet contour-line is at an angle of 45 ; hence the 

 difference between the sub-aerial and the sub-aqueous slopes is in this 

 place very marked. Rudha Chailleach (the witch's point) is a narrow 

 spit of shingle stretching out to a considerable distance into the loch, 

 with deep water close to the shore. From this point a narrow channel 

 of deeper water projects right across the loch towards the opening 

 between Eilean Subhainn and Garbh Eilean. 



The ridge between the Slattadale and Ghruididh basins is merely a 

 continuation of the islands. The depths on it are much less than on 

 either of the other ridges; there is, however, a fairly deep channel, 

 through which the steamer passes, ranging in depth from 62 feet to 

 28 feet; this channel is narrowest and shallowest between Isle Maree 

 and Eilean Eachainn. To the south of Isle Maree is a large sand-flat, 

 which in July, 1902, was covered by less than a foot of water, and on 

 which were many boulders rising above the surface of the water. 



The areas between the consecutive contour-lines, and the per- 

 centages to the total area of the loch, are as follows : 



to 50 feet 2090 acres 29 '6 per cent. 



50,, 100 , 1283 18-2 



100,, 150 



150 200 



200 250 



250,, 300 



300,, 350 



Over 350 



1066 15-1 



877 12-4 



977 13-9 



412 5-8 



254 3-6 



99 , 1-4 



7058 100-0 



It will be observed that the zone between 200 and 250 feet is larger 

 than that between 150 and 200 feet, otherwise the areas between the 

 contour-lines drawn in at equal intervals decrease gradually with 

 increase of depth. 



The Small Loch on Eilean Subhainn. Apparently this loch has not 

 been considered important enough to receive a name, but the fact that 

 it had the appearance of being of some depth, whereas the other lochs 

 on the islands on Loch Maree are overgrown with weeds or moss, 



