4 BATHYMETRICAL SURVEY OF 



400-feet contour-lines is about 415 acres, or 13 per cent, of the entire 

 area of the loch. 



The 200-feet depression is 5J miles in length and half a mile in 

 maximum breadth, extending from south of Ellen's isle to near Black 

 island, where it is separated (by a sounding of 198 feet) from a small 

 isolated area, lying between Coilachra and Black island, one-third of a 

 mile in length by nearly one-eighth of a mile broad. The area between 

 the 200- and 300-feet contours is about 510 acres, or 17 per cent, of the 

 area of the loch. 



There are two 100-feet depressions, the principal one (6 miles in 

 length) stretching from close to Ellen's isle to Black island, the other 



FIG. 4. LOCH ARKLET, LOOKING WEST. 



(Photograph by G. W. Wilson.) 



extending from Black island towards the point called Rudha nam 

 Moine, with a total length of over half a mile. The area enclosed 

 between the 100- and 200-feet contours is about 670 acres, or 22 per 

 cent, of the area of the loch. 



The 50-feet line follows pretty closely the contour of the loch, from 

 Rudha nam Moine into the eastern arms of the loch at the Trossachs, 

 running outside of Black island, Ellen's isle, and the small islands near 

 the shore all round, with a small isolated patch at the junction of the 

 Trossachs arm with the arm leading to Achray Water; it encloses a 

 small shallow, with a beacon on it, opposite the entrance of the Glasa- 

 hoile. The area between the 50- and 100-feet contours is about 400 



