There are 7 National Natural Landmarks in Iowa.
Name Image Date Location County Ownership Description Anderson Goose Lake Iowa Private One of the few essentially natural glacial pothole lakes remaining in Iowa. Cayler Prairie Dickinson State An example of the increasingly rare virgin prairie grassland. Cold Water Cave Winneshiek Private An exceptional example of an extensive cave system well decorated with speleothems. Dewey's Pasture and Smith's Slough Clay, Palo Alto State Pothole lakes created during the last glacial epoch. Hayden Prairie State Preserve Howard State A true prairie remnant. Loess Hills Harrison, Monona State, private The best examples of loess topography in the Missouri River Bluffs region. White Pine Hollow State Forest Dubuque State The only known remaining white pine tract in Iowa.
See also List of National Historic Landmarks in Iowa