Il6 SCENERY OF SWITZERLAND. 
therefore a height of 250 metres;* and (3) the most 
striking of all, that of the Illgraben near Leuk. The 
amount of stones, etc., brought down by tliese three 
torrents has been so enormous as to dam back the 
river, and thus raise the general level of the valley 
for some distance above them. 
The plain of the Rhone valley where the river 
enters the lake is almost absolutely flat, but from 
Noville to Chessel are a number of undulations, and 
small hills, those to the west being the highest. At 
first they might be taken for moraines. They are, 
however, due to a great rockfall. 
The originally horizontal beds near Noville have 
been thrown into zigzags by the pressure of the fallen 
* Renevier, Beitr. z. Geol. K. d, Schw,, L. xvi. 
