82 FLORA OF ARROCHAR MOUNTAINS. 
the Cruach from Ben Vorlich, and in its upper portion extends 
for about three miles between the masses of Ben Vorlich and Ben 
Vane. The northern end of this valley, at an altitude of a little 
over 800 feet, is occupied by Loch Sloy, a lake about one and a 
half miles in length, and a little over two hundred yards broad at 
its widest part. By means of this deep valley the whole mass of 
Ben Vorlich is rather sharply separated off from the other hills ; 
but, with the exception of this mountain, and the Cruach, all the 
other peaks are more or less connected by lofty ridges, their 
summits thus forming in reality only the different crowns of a 
single huge mountain mass. Three of these, namely, Ben Arthur, 
' Ben Ime, and Ben Vane, are divided from each other, and from 
the other two by definite gullies, the largest of which is 
Coiregrogain, which extends upwards for about two’ miles from 
the Inveruglas, between the steep southern face of Ben Vane and 
the ridge of Ben Narnain, to the co/ between the latter mountain 
and Ben Ime, at an altitude of 2,200 feet. The peaks of Ben 
Narnain and Crois are connected by a high continuous ridge of 
roughly semi-circular outline, with precipitous rocks facing the 
south-east, this grand amphitheatre enclosing the great Corrie of 
Narnain, or Corrie-Sugach, one of the most magnificent bits cf 
hill-scenery in the district. 
The mountain streams are a feature of special interest from our 
present point of view, as they form an important hunting-ground 
of the botanist. The principal streams of the district are the 
following :— 
1. The Inveruglas Water, a stream of considerable size, which 
drains Loch Sloy, and after a course of about three miles enters 
Loch Lomond at Inveruglas Farm, almost exactly opposite 
Inversnaid. The Inveruglas valley, already referred to, is the 
only piece of truly characteristic river-scenery in the district, and 
has many attractions for the lover of the picturesque and sublime. 
2. The Allt-Coiregrogain, rising on the northern side of Ben 
Narnain, and, after being joined by a considerable stream which 
flows down the north-eastern side of Ben Ime, enters the Inveruglas 
near the foot of Crois. 
3. The Glen Loin burn, chiefly remarkable for the fact that it 
flows, throughout the greater part of its length, between cultivated 
fields, an unusual feature in this wild hill-country. 
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