The setting for the novel is the Pecos Valley in New Mexico. The valley is situated on the western edge of the Great Plains Province, which comprises the eastern third of the state. It is bounded on the west by the Southern Rockies and on the east by the bluffs of the Llano Estacado. The Llano is bounded on the east by the Canadian River and on the west by the Pecos River. The area is part of the Lower Sonoran zone of mesquite and black grama grass. Altitudes are below 4,500 feet, allowing for more grazing than do areas at higher elevations. The long, frost-free period, the fertile soil of the valley, and the high temperatures make the area an important agricultural zone. The flood plain of the valley is farmed and the plains of the Llano are grazed, with just enough water to permit both modes of production. Bless Me, Ultima
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