S P Crater is a cinder cone volcano in the San Francisco volcanic field, 25 miles (40 km) north of Flagstaff, Arizona, United States.

It is a striking feature on the local landscape, with a well-defined lava flow that extends for 4.3 miles (7 km) to the north.

[5] When viewed from certain angles on the ground, the combination of the smooth round shape of the cone, the dark lava spatter on the rim, and the long dark lava flow extruding from the base may resemble human waste.

A lava flow extends to the north of the cone for about 7 km (4.3 mi) and originated from the same vent.

K–Ar dates on the lava are about 70 ka,[10] but are considered unreliable because of excess argon[11] and the un-weathered young appearance of the cone.