The San Simon Wash Basin, located in the southeastern part of the planning area is 2,284 square miles in area.  Geographic features and principal communities are shown on Figure 7.8-1.  The basin is characterized by plains and valleys bordered by mountain ranges including the highest elevation mountain range in the planning area.  Vegetation types include Lower Colorado River Valley and Arizona uplands Sonoran desertscrub, semi-desert grassland and madrean evergreen woodland along the eastern basin boundary.  (See Figure 7.0-9)

Principal geographic features shown on Figure 7.8-1 are:

• San Simon Wash running north-south through the center of the basin
• Valleys and plains including the Quijotoa Valley in the northern portion of the basin, the Gu Oidak Valley in the center of the basin and the Baboquivari Valley in the southeastern portion of the basin
• Mountain ranges including the Ajo Range on the southwestern basin boundary and the Baboquivari Mountains on the southeastern basin boundary
• The highest point in the basin at 7,730 feet in the Baboquivari Mountains
• The lowest point at about 1,650 feet where San Simon Wash enters Mexico.

Figure 7.8-1 San Simon Wash Basin Geographic Features

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References and Supplemental Reading for the San Simon Wash Basin