THE FRESH-WATER LOCHS OF SCOTLAND. 
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a maximum breadth of 5 miles about 3 miles above the exit of the river 
Leven at Balloch ; the mean breadth of the entire loch is about miles. 
In superficial area Loch Lomond is the largest of all the Scottish fresh- 
FIG. 27. — INDEX MAP OP THE CLYDE BASIN. 
water lochs, being estimated to cover 27^ square miles ; its nearest rival 
in this respect is Loch Ness, with 21| square miles, followed by Loch 
Awe with less than 15 square miles. The area draining into the loch 
