Many areas in the state of Michigan have been designated as Nature Centers, Fens, Bogs and Prairies.  Conservationists and Master Gardeners are working to preserve these important areas for our state eco-system.   A Fen can be a wetland, grassy marsh, forested swamps or peat bogs.  Along with bogs, fens are a type of mire.  They are usually fed by mineral rich ground or surface water.  They contain grasses and sedges.  They also contain many carnivorous plants.  They may be found a long lakes and rivers.  Bogs are different from Fens as they are usually acidic.  Bogs are also considered wetlands.  For further information about Bogs and Fens check out Private Land Partnerships, Michigan Department of Natural Resources.  Michigan has many areas designated as Prairie sites.  These areas are made up of herbaceous plants, mainly grasses and few to no trees.  These areas are very important to agricultural development.  For further information about Prairies in Michigan check out Prairies, where?, Michigan State University and The Big Prairie Desert Story.

Informational websites regarding Nature Trails, Fens and Bogs:
This website contains a complete list of hiking trails and includes maps of each area.  It also provides a blog and newsletter written by Jim DuFresne.
Land Conservancy of West Michigan
State of Michigan - Bogs and Fens
Michigan Natural Features Inventory - Prairie Fen [Michigan State University Extension]
Exploring the Prairie Fen Wetlands of Michigan [Michigan State University Extension] 
Michigan Nature Association
Beavers Disrupt Fen - Hannah Ettema - Michigan Nature Association
Prairie Fen preserved in an Urban Environment - Tyler Bassett, Kalamazoo Nature Center

List of Nature Centers, Conservatories, Fens and Bogs in the State of Michigan 2014

Anderson Woods Nature Preserve - Muskegon, MI
Bay City Recreation Area - Bay City, MI
Blandford Nature Center - Grand Rapids, MI
Boardman River Nature Center - Traverse City, MI
Brooks Nature Area - Marshall, MI
Burgess-Shadbush Nature Center, Shelby Township, MI (586) 323-2478
Cadillac Heritage Nature Study Area (Mitchell SP) - Cadillac, MI
Calvin College Ecosystem Preserve - Grand Rapids, MI
Carney Fen - Carney, MI
Chippewa Nature Center - Midland, MI
Dahlem Environmental Education Center, Jackson, MI
Degraaf Nature Center - Holland, MI
DeVries Nature Conservancy - Owosso, MI
Dinosaur Hill Nature Preserve - Rochester, MI
Drayton Plains Nature Center - Watterford, MI
Eddy Discovery Center - Chelsea, MI
Farmington Hills Nature Center - MI
Fenner Nature Center - Lansing, MI
Fernwood Botanical Garden and Nature Preserve - Niles, MI
For-Mar Nature Preserve and Arboretum - Burton, MI
Fred Meijer Heartland Trail - West MI area
Harris Nature Center - Okemos, MI
Hartley Outdoor Education Center - St. Charles, MI
Hawk Woods Nature Center - Auburn Hills, MI
Hoffmaster State Park - Muskegon, MI
Howard Christensen Nature Center, Kent City, MI
Howell Conference and Nature Center - Howell, MI
Hudson Mills Metropark - Ann Arbor, MI
Indian Springs Metropark - White Lake, MI
Ives Road Fen Preserve - Tecumseh, MI
E. L. Johnson Nature Center - Bloomfield Hills, Oakland
Kalamazoo Nature Center - Kalamazoo, MI
Kellogg Experimental Forest - Augusta MI
Kensington Park Nature Center - Milford, MI
Kettunen Center - Tustin, MI
Lake St. Clair Metropark - Harrison Township, MI
Lamberton Lake Fen Nature Preserve - Grand Rapids, MI
Lefglen’s Prairie Fen - Wolf Lake Rd. Jackson County, MI
Leslie Science & Nature Center - Ann Arbor, MI
Lloyd A. Stage Nature Center - Troy, MI
Love Creek Nature Center - Berrien Center, MI
Marguerite Gahagan Nature Preserve - Roscommon, MI
Mass Family Nature Preserve - Rockford, MI
Marshlands Museum and Nature Center - Brownstown, MI
MosseWood Nature Center - Marquette, MI
Nankin Mills Nature Center - Westland, MI
Nature Discovery - Williamston, MI
Nature Education Center at Hemlock Crossing Park - West Olive, MI
Nichols Arboretum - Ann Arbor, MI
Oakwoods Park Nature Center - Belleville, MI
Outdoor Discovery Center Macatawa Greenway - Holland, MI
Paw Paw Prairie Fen Preserve - Paw Paw, MI
Pierce Cedar Creek Institute - Hastings, MI
Pine River Nature Center - Goodells, MI
Raven Hill Discovery Center - East Jordan, MI
Red Oaks Nature Center - Madison Heights, MI
Sarett Nature Center - Benton Harbor, MI
Saul Lake Bog Nature Preserve - Rockford, MI
Seven Ponds Nature Center - Dryden, MI
Sterling Heights Nature Center - Sterling Heights, MI
Stony Creek Metropark Nature Center - Shelby, MI
Stubnitz Environmental Education Center - Adrian, MI
Tallmadge Woods - Saugatuck, MI
Thompsons Harbor State Park Coastal Fen - A long the shores of Lake Huron
Thorne Swift Nature Preserve - Harbor Springs, MI
Thurston Nature Center - Ann Arbor, MI
University of Michigan - Dearborn Environmental Interpretive Center - Dearborn, MI
Waldeck Island - Cadillac, MI
Whitefish Point Bird Observatory - Paradise, MI
Wint Nature Center - Clarkston, MI
Wittenbach/Wege Environmental Center - Lowell, MI
Woldumar Nature Center - Lansing,

Michigan Nature Association website This website is very informative with a great map so you can find locations near you.
Michigan Department of Natural Resources