266 | THE BEAUTIES OF NATURE CHAP. 
Sometimes two lateral valleys (see Plate) 
come down nearly opposite one another, so 
that the cones meet, as, for instance, some 
little way below Vernayaz, and, indeed, in 
several other places in the Valais (Fig. 31). 
Or more permanent lakes may be due to a 
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ridge of rock running across the valley, 
as, for instance, just below St. Maurice in 
the Valais. 
Almost all river valleys contain, or have 
contained, in their course one or more lakes, 
and where a river falls into a lake a cone like 
