i 62 The National Geographic Magazine 



Location of and Annual Precipitation at Certain Stations in the Arid Region of 

 Western America. Chiefly from Records of the U. S. Weather Bureau 



traced by lines connecting the stations 

 shown in the accompanying map. These 

 regions may be designated as the Sonora - 

 Nevada Desert and the Chihuahua 

 Desert. 



The Sonora- Nevada Desert embraces 

 portions of Utah, Idaho, Washington, 

 Oregon, Nevada, California, Arizona, 

 Baja California, Sonora, and Sinaloa. 



The northern portion of this region is 

 mainly comprised in the Great Basin, 

 and embraces the beds of a number of 

 ancient lakes and the surviving Great 

 Salt Lake. Other special physiographic 

 features of interest in this connection 

 are the areas which bear the names of 

 Snake River Desert of Idaho, the Sage 

 Plains of Washington, the Lava Beds of 



