HomeUSASouth DakotaCuster State ParkSylvan LakeSylvan Lake BoulderingSylvan Lake BoulderingLAT,LNG 43.84723, -103.56312CREATED UPDATED Edit MapShareDescription[Edit]No description available. Be the first to contribute!Add description 13 Areas New Areas1Outlet Boulder, TheCRAG2Upside Down BouldersAREA3Drop the Base BoulderCRAG4Don Juan Boulder, TheCRAG5Coach Z BoulderCRAG6Campground BoulderCRAG7Throne BouldersAREA8Rivendell BouldersAREA9Backside Damn BoulderCRAG10Acid Test BoulderCRAG11Northeast Gully BouldersAREA12Honey Moon BouldersAREA13Day Use AreaAREA