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Whoop De Dogs – Flat Rock Loop Professional Review and Guide
"Above the vineyards of Napa Valley in the town of Angwin is a network of trails on Howell Mountain. The privately owned (but open to the public) land is a hidden jewel. A complex tapestry of trails winds many miles through the shaded forest. This hike forms a loop on the south edge of the open space along the border of Las Posadas State Forest. The undulating trail loops through an arboreal canopy of redwoods, oaks, gray pine, Douglas fir, manzanita, and madrones."
--Robert Stone, Day Hikes Around Napa Valley (Day Hike Books).
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