You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Mantua Fen State Nature Preserve. .4 mile due west of Vaughn Rd & .2 mile due south of Mennonite Rd, Mantua Twp. Remove constraint Place: Mantua Fen State Nature Preserve. .4 mile due west of Vaughn Rd & .2 mile due south of Mennonite Rd, Mantua Twp.