Spectacular rock formations are found throughout this scenic area in the form of large outcroppings of vaqueros sandstone. A particularly impressive monolith containing the historic Wagon Cave is located at the eastern edge of the potential addition. This unique area also shows evidence of prehistoric occupation, including several midden-filled rock shelters and clusters of bedrock mortars.
From its source within the existing Ventana Wilderness, the San Antonio River flows through nearly three miles of the potential addition. This major stream supports a thriving trout fishery as it winds its way through a deep canyon before emerging into the flatlands at the area's boundary. The river still supports a remnant population of beaver. Carrizo Creek, a tributary of the San Antonio River, is wholly within the unit.
Vegetation consists primarily of chaparral and broadleaf species in upland areas. In the river canyons, riparian vegetation is particularly noteworthy.
