Hikes›United States›Michigan›Sleeping Bear Dunes National Lakeshore›Advanced TrailAdvanced TrailDay hike · 6.5 km · ↑ 117 mIn Sleeping Bear Dunes National Lakeshore, MichiganTrip reports and guidesAdvanced Trail Building: ‘Switchberm’trailism.com · trail guideAdvanced Trail Building: Introducing the 'Switchberm'imba.com · Jan 2013 · trip report
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