The Sloan NE 7.5-minute quadrangle is located just south of Las Vegas, NV and includes housing developments in the City of Henderson, as well as a large part of the Sloan Canyon National Conservation Area. The map area straddles the crest of the northern McCullough Range including Black Mountain, the highest peak in the range. This ridgeline is part of the northwestern segment of the drainage divide between the hydrologically closed Eldorado Valley and Las Vegas Valley, which is part of the Colorado River watershed.