THE FRESH-WATER LOCHS OF SCOTLAND. 



53 



LOCHS OF THE TAY BASIN. 



E 'tent of the Tay Basin. The whole area of the drainage basin of 

 the Tay, including the estuary as far as a line joining Tents Muir Point 

 with Monifieth, as measured with the planimeter on the 1-inch Ordnance 

 Survey maps, is 2509*73 square miles.* Considerably more than one- 

 fourth of this area drains directly into fresh-water lochs, of which there 



30 ng Milt 



FIG. 14. INDEX MAP OF THE TAT BASIN. 



are seventy, including some of the largest in Scotland Lochs Tay and 

 Ericht, for instance, being over 14 miles in length, while eight of them 

 exceed 2 miles in length. 



* Geikie (An Elementary Geography of the British Islands, London, 1888, p. 86) gives the 

 drainage basin of the Tay as 2250 square miles and Lawson (The Geography of River Systems, 

 London, N.D., p. 6) as 2400 [square] miles. According to Geikie, the Tay pours a larger 

 volume of water into the sea than any other British river, and its drainage area is the largest 

 in Scotland, and seventh in point of size in the British Islands, being exceeded by that of 

 the Shannon in Ireland, the Thames, Severn, Ouse, Trent, and Great Ouse in England. 



