24 RURAL CALIFORNIA 



terfere seriously with harvesting of beans and other 

 field crops. 



The Interior Valley region. 



This region extends from the north end of the 

 Sacramento Valley southward through the length of 

 the San Joaquin Valley to the Tehachapi Mountains, 

 which form its southern boundary. This pair of con- 

 nected valleys constitute what is properly called "The 

 Great Valley of California/' about 400 miles long 

 and from 40 to 60 miles wide. It contains a larger 

 body of productive land than any other subdivision 

 of the State. Central on the west side of the Great 

 Valley are the deltas of the two great rivers whose 

 names designate their respective valleys. The break 

 in the Coast Eange which gives outlet for their wa- 

 ters to the Bay of San Francisco, also admits an in- 

 terior extension of coast influences that modify .cli- 

 matic conditions over these deltas and adjacent lands, 

 as is indicated by the circular intrusion of Division 

 2 into Division 4 as shown on Plate III. This cir- 

 cular area is somewhat different in climatic charac- 

 ters, however, from those of either of the divisions 

 to which it is related, for it is a blending of the two. 



In the extreme southeast part of the State another 

 area marked Division 4 is connected with the Great 

 Valley because it has closer resemblance thereto, both 

 in characters and products, than to any other re- 

 gion. It comprises the Imperial Valley and other 

 valleys adjacent to the Colorado River. It differs 

 from the Great Valley in having a higher tempera- 



