FEDERAL AND STATE RESERVATIONS 937 
The San Francisco Mountain, in the San Fran- 
cisco Mountains Reservation, is a fine extinct vol- 
cano, surrounded by a district of cinder cones and 
lava beds. These mountains reach a height of nearly 
thirteen thousand feet, and are covered with one of 
the finest forests of the Southwest. 
Extending southeastward in a long irregular shape 
to the New Mexican line is the Black Mesa Reserva- 
tion. There it borders the Gila Reservation in New 
Mexico. In these reservations the headwaters of the 
Gila River are located. This river empties into the 
Colorado River at Yuma. Although it “ runs dry ” 
occasionally, it is, next to the Colorado, the most 
important stream in Arizona. ‘This reservation is 
more or less forested. The principal cultivated re- 
gions are irrigated lands along the Little Colorado, 
and along the Gila River and its principal! branch, the 
Salt River. 
There is another reservation in New Mexico not 
far from the city of Santa Fé. It is called the Pecos 
River Reservation. The irrigation in practise along 
this river is most notable because of its magnitude. 
This reservation is also at the headwaters of several 
branches of the Rio Grande, along which for some 
distance there is irrigated land. It is a feeder also to 
the Canadian River, which empties its waters into 
the Mississippi via the Arkansas. The Canadian 
