Where is the savage reservation located ?Brave New World by Aldous Huxley

When Lenina and Bernard leave for the Reservation in New
Mexico of the former United States, they depart from London and the Charing T Rocket
Station, formerly Charing Crossing, the London railroad station, and take the
Blue Pacific Rocket over New Orleans and then past a tornado in
Texas. Finally, they spend a night in Santa Fe, New Mexico before going the next
morning ona plane which a Reservation guard has landed on the roof of the hotel.  Ten
minutes later they cross "the frontier that separated civilization from savagery." 
Surrounding the reservation in Malpais is a high-voltage wire that prevents any person
or animal from escape.

Ironically, the name
Malpais is a combination of two Latin words:
mal, which means bad and pais, like
paix, or peace. On this reservation, the Indians do have a peace
from the servitude of the New World, but it is a peace at the price of squalor and
primitive ignorance. And, it is the malcontent, Bernard, who seeks a type of peace from
his world where he has just learned that he is going to be sent to Iceland for his
behavior.