THE TICINO. 
227 
valley, which again may be divided into sections 
from Chironico to Biasca, Biasca to Bellinzona, and 
Bellinzona to the Lago Maggiore. 
The river terraces (Fig. 145), or at anyrate 
several of them, are well marked in the Val Leven- 
tina, sometimes in small detached pieces, sometimes 
in larger stretches rendered conspicuous by the white 
Campanile of the churches in the middle of the 
Mountain villages. 
In many places, however, the terraces have dis- 
appeared, and the sides of the valley are so steep 
that those which remain are far from secure. The 
valley has been the scene of many catastrophes 
15* 
