LAKES AND SHORES 



149 



the earliest European civilization grew up about the lakes of Swit- 

 zerland, while the lakes of Mexico and Peru were the seats of the 

 ancient civilizations of those countries. 



Salt lakes. A few lakes are salt, and some salt lakes are the 

 descendants of lakes which were fresh. Great Salt Lake is an ex- 



Fig. 151. Map of the former Lake Bonneville, in Utah. The area with the 

 lighter shading shows the former extent of the lake. The heavier shading 

 shows the present Great Salt Lake, Sevier Lake, and Utah Lake, which 

 occupy the deeper spots in the bottom of the former Lake Bonneville. 



iple. This lake is very shallow and occupies the lowest part of 

 a basin of great size. The lowest point in the rim of this basin is 

 about 1,000 feet above the present lake; but water once filled the 



