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From List of National Natural Landmarks, these are the National Natural Landmarks in Iowa. There are 8 in total.

Name Image Date Location County Ownership Description
1 Anderson Goose Lake 1975 42°18′56″N 93°37′26″W / 42.315556°N 93.623889°W / 42.315556; -93.623889 (Anderson Goose Lake) Iowa Private One of the few essentially natural glacial pothole lakes remaining in Iowa.
2 Cayler Prairie 1965 43°23′50″N 95°14′38″W / 43.397222°N 95.243889°W / 43.397222; -95.243889 (Cayler Prairie State Preserve) Dickinson State An example of the increasingly rare virgin prairie grassland.
3 Cold Water Cave 1987 43°26′28″N 91°57′37″W / 43.44111°N 91.96028°W / 43.44111; -91.96028 (Cold Water Spring State Preserve) Winneshiek Private An exceptional example of an extensive cave system well decorated with speleothems.
4 Dewey's Pasture and Smith's Slough 1975 Clay, Palo Alto State Pothole lakes created during the last glacial epoch.
5 Hayden Prairie State Preserve 1965 43°26′22″N 92°22′59″W / 43.4395°N 92.3831°W / 43.4395; -92.3831 (Hayden Prairie State Preserve) Howard State A true prairie remnant.
6 Loess Hills 1986 41°48′05″N 95°59′42″W / 41.8013°N 95.995°W / 41.8013; -95.995 (Loess Hills) Harrison, Monona State, private The best examples of loess topography in the Missouri River Bluffs region.
7 White Pine Hollow State Forest 1967 42°37′47″N 91°06′43″W / 42.62971°N 91.11207°W / 42.62971; -91.11207 (White Pine Hollow State Forest) Dubuque State The only known remaining white pine tract in Iowa.