There are 11 National Natural Landmarks in Idaho.
Name Image Date Location County Ownership Description Big Southern Butte Atomic City Butte federal (Bureau of Land Management) A 2,500 ft Rhyolitic dome that rises over the Eastern Snake River Plain. It illustrates the scope and dimensions of Quaternary volcanism in the western United States. Big Springs Island Park Fremont federal (Caribou-Targhee National Forest) The only first-magnitude spring in the country that issues forth from rhyolitic lava flows. Cassia Silent City of Rocks Malta Cassia federal (City of Rocks National Reserve) Monolithic landforms created by exfoliation processes on exposed massive granite plutons. Crater Rings Mountain Home Elmore federal (Morley Nelson Snake River Birds of Prey National Conservation Area) Two adjacent and symmetrical pit craters that are among the few examples of this type of crater in the continental United States. Great Rift of Idaho Craters of the Moon National Monument and Preserve Blaine, Minidoka, Power federal (Craters of the Moon National Monument and Preserve) A tensional fracture in the Earth's crust. Hagerman Fauna Sites Hagerman Fossil Beds National Monument Twin Falls federal (Hagerman Fossil Beds National Monument) Contains the world's richest deposits of Upper Pliocene age terrestrial fossils. Hell's Half Acre Lava Field Blackfoot Bingham, Bonneville federal (Bureau of Land Management) Fully exposed pahoehoe lava flow. Hobo Cedar Grove Botanical Area Shoshone Shoshone federal (St. Joe National Forest) An outstanding example of pristine western red cedar forest. Menan Buttes Menan Jefferson, Madison federal (Bureau of Land Management) Contains outstanding examples of glass tuff cones, which are found in only a few places in the world. Niagara Springs Hagerman Gooding private Least developed of the large springs discharging into the Snake River from the Snake River plain aquifer system. Sheep Rock Council Adams federal (Payette National Forest) Horizontally layered lavas that represent successive flows on the Columbia River Basalt Plateau.
See also
List of National Historic Landmarks in Idaho