1984 Map of St. Thomas Gap

About this map

St Thomas Gap serves as a critical topographic corridor within this arid landscape, straddling the boundary between Clark County and Mohave County along the Nevada-Arizona state line. The survey captures a high-elevation environment dominated by the Virgin Mountains and the prominent Whitney Ridge, which define the drainage patterns of the region. The map reveals an intricate network of desert watercourses, including Black Wash and the distinctively named Pussy Willow Wash, which flow through the expansive Greasewood Basin. These features illustrate the complex alluvial geology of the Mud Hills and Wechech Basin. Historically, these gaps and washes provided the most viable routes through the high desert, long before modern infrastructure altered the accessibility of the borderlands.