2018 Map of Presumido Peak

About this map

The United States and Mexico border defines the southern reach of this Pima County landscape, where the high desert meets the steep slopes of the Baboquivari Mountains and Pozo Verde Mountains. In this arid environment, the drainage patterns of numerous ephemeral waterways, including Gallineta Wash, Aros Wash, and La Osa Wash, dictate the geography of the Altar Valley. The map reveals a remote ranching and transit landscape, characterized by isolated landmarks such as Presumido Peak and Aguirre Lake. Notable for its physical barriers and natural corridors, the area includes the narrow Presumido Pass and the suggestively named Smugglers Canyon. Human presence is marked by sparse infrastructure like Sierra Vista Ranch Rd and La Osa Ranch Rd, which navigate the broad Compartidero Flats near the international boundary.