Beaches near Sylvan Lake Harney Trail, Pennington County, South Dakota Sylvan Lake Harney Trail Main Page HIGH QUALITY TOPO MAP, CLICK HERE More Information about Sylvan Lake Harney Trail, Pennington County, South Dakota Nearest metro area is Spearfish, South Dakota Click here for more outdoors activities near Spearfish, South Dakota General Camping Information List of nearby beaches: * Distances listed are direct linear distances, actual travel distance may be different. MORE INFO ABOUT NEARBY BEACHES:           Please make a selection Go to South Dakota Outdoors Index