Boggs state forest. Base of tree stump adjacent to Gales trail at the trail's highest elevation. Flat terrain in general location, no slope. Not heavily forested, sparse trees (ie ponderosa pine). Appears similar to the "badger den" at Pepperwood Preserve in terms of entrance size and shape. Didn't look like a burned out tree root to me, too distinct. I can see up four feet of den length with no terminal.