222 
SCENERY OF SWITZERLAND. 
three main branches, the Vorder Rhine, the Hinter 
Rhine, and the Albula. The two latter, after meet- 
ing near Thusis, unite with the Vorder Rhine at 
Reichenau, and run by Chur, Mayenfeld, and Sargans 
into the Lake of Constance at Rheineck. At some 
former period, however, the drainage of this district 
was very different. 
The Vorder and Hinter Rhine united then, as 
they do now, at Reichenau, but at a much higher 
level, and ran to Mayenfeld (Fig. 60), not by Chur, 
but by the Kunkels Pass to Sargans, and so onwards 
not to the Lake of Constance, but to that of Zurich. 
The Landwasser at that time rose in the Schlap- 
pina Joch, and after receiving as tributaries the 
Vereina and the Sardasca, joined the Albula, as it 
does now at Tiefenkasten; but instead of going round 
to meet the Hinter Rhine near Thusis, the two to- 
gether travelled parallel with, but at some distance 
from, the Hinter Rhine, by Heide to Chur, and so 
to Mayenfeld. 
As we look up from Tiefenkasten towards Heide 
and the Parpan Pass it seems almost incredible that 
the Oberhalbstein Rhine can ever have taken that 
course. I give therefore (Fig. 61) the following pro- 
file showing the old river terrace, but with the height 
exaggerated in comparison with the distance. This, 
