?Suman Fen in Porter County, Indiana near Jackson Township. Part of the Moraine Addition Nature Preserve Complex. Not open to the public, Suman Fen is one of the highest quality fens in Northwest's Indiana, with many rare plants and insects. Take this opportunity to join the Indiana Division of Nature Preserves’ Regional Ecologist Derek Nimitz to explore this rare wetland ecosystem. Suman Fen does not have trails and some may find the terrain difficult to walk on.