THE FRESH-WATER LOCHS OF SCOTLAND. 



335 



Beauly is formed by the junction of the river Farrar with the river 

 Glass. The river Glass is formed by the junction of the Amhuinn 

 Deabhaidh (bearing the outflow from Loch na Beinne Baine) with the 

 river Affric, while the river Cannich is a tributary of the river Glass. 

 The river-systems within the Beauly basin, and the relative positions 

 of the different lochs, are shown on the accompanying index-map 

 (Fig. 50). The area of the entire basin, as measured with the plani- 

 meter on the 1-inch Ordnance Survey maps, is about 343 square miles, 

 of which about 215 square miles (or 63 per cent.) drain into these 



J oartfiohme-w 



English Miles 



I * 3 4 S 



FIG. 50. INDEX MAP OF THE BEAULY BASIN. 



thirteen lochs, as will be seen from the summary table on p. 350. 

 An inspection of the summary table shows, further, that all the 

 lochs exceed half a mile in length, while eight of them exceed a 

 mile in length; the two largest lochs (Mullardoch and Monar) exceed 

 4 miles in length, and have each an area exceeding a square mile. 

 Seven of the lochs exceed 100 feet in depth, and two of them exceed 

 200 feet, the deepest one being Loch Monar, with a maximum depth 

 of 260 feet; this loch is also the one containing the largest volume 

 of water. The boundary-line between the counties of Inverness and 

 Ross runs up the centre of Loch Monar for the greater part of its 

 length, and it crosses Loch Mullardoch in its central portion, so that 



