Visitors to tallgrass prairie have described the grass's undulating movement as the heaving of a vast ocean. The grasses that make up the swells-big bluestem, prairie junegrass, side-oats grama-provide rich forage and shelter for a host of birds and mammals. Much of the prairie has been plowed under in the past 200 years. Today less than 1 percent of North America's tallgrass prairie remains. The Sierra Club is committed to preventing destruction of the rest, including the Sheyenne National Grasslands, so that future travelers can witness the inland sea.

Not listed.