The Long Valley Experimental Forest (LVEF) encompasses two sections (1,280 ac) of Ponderosa Pine forests about 46 miles south of Flagstaff, Arizona.  The LVEF was established in 1936 as a counterpart to the Fort Valley Experimental Forest because of its contrasting limestone/sandstone soils as opposed to basalt-derived clay loam of the Fort Valley Experimental Forest and because it contained some of the best stands of Ponderosa Pine on the Coconino and Sitgreaves National Forests.  Today the LVEF comprises some of the last remaining continuous stands of un-harvested Ponderosa Pine forest in northern Arizona.

Long Valley Experimantal Forest is located about 45 miles south of Flagstaff AZ in the Coconino National Forest