18,327 acres of old growth on the Lake Superior divide
The Forest Service describes Sylvania as 18,327 acres of primitive land inside the National Wilderness Preservation System, holding 34 named lakes, 50 designated backcountry campsites, and old-growth forest that shelters rare orchids, bald eagles, loons and osprey. Some lakes carry sandy beaches; others are ringed by record-size red and white pines.
Sylvania sits on the watershed divide between Lake Superior and the Mississippi River, which is why its lakes are fed by springs and local run-off rather than inflowing streams — the reason the water is as clear as it is, and the reason the Forest Service treats these lakes as fragile enough to warrant their own fishing rules.
Source: USFS Ottawa National Forest — Sylvania Wilderness Backcountry Camping
A private fishing club that became a wilderness
The country was used for generations by Ojibwe people, known from scattered artifacts found in the area. In 1895 the Wisconsin lumberman A.D. Johnston bought 80 acres at the south end of Clark Lake meaning to cut the big pines, saw the place, and decided instead to keep it standing. Friends bought adjoining land, and the Sylvania Club was formed around fishing, hunting and hiking, with lodges and cabins on the larger lakes and a guest list of a few wealthy and well-connected families.
The Forest Service bought the whole property in 1967, removed the buildings, and managed it as a special recreation area until Congress designated it federal wilderness under the Michigan Wilderness Act of 1987. The Thompson Lodge trailhead name is one of the few surviving echoes of the club era.
Source: Wikipedia — Sylvania Wilderness (history)
The rules that keep it quiet
Forest Order 09-07-21-07 is what makes Sylvania feel different from a busy lake district. Inside the wilderness the Forest Service prohibits wheeled and mechanical devices, fireworks, metal detectors without authorisation, and pack or saddle animals. Camping is allowed only at sites marked by an agency fire ring, with no more than six people at a site, no more than fourteen consecutive nights in one site, and no more than ten people travelling together on any trail, portage or water.
Source: USFS Ottawa National Forest — Wilderness Order 09-07-21-07