From List of National Natural Landmarks, these are the National Natural Landmarks in Tennessee. There are 13 in total.

Big Bone Cave

Cedars of Lebanon State Park

The Lost Sea

Cumberland Caverns

Reelfoot Lake

Savage Gulf

Dick Cove

May Prairie

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Tennessee National Natural Landmarks (clickable map)

	Name	Image	Date	Location	County	Ownership	Description
1	Arnold Engineering Development Center Natural Areas		1974		Coffee	federal (Arnold Air Force Base)	Contains an extremely rare virgin swamp forest and a pristine example of an open marsh.
2	Big Bone Cave		1973	35°46′21″N 85°33′25″W / 35.7726°N 85.557°W / 35.7726; -85.557 (Big Bone Cave)	Van Buren	state	Cave where giant ground sloth bones were discovered.
3	Cedar Glades		1973	36°04′25″N 86°18′41″W / 36.07366°N 86.31151°W / 36.07366; -86.31151 (Cedars of Lebanon State Park)	Wilson	state (Cedars of Lebanon State Park)	The largest and best remaining example of the cedar glade community.
4	Conley Hole		1973		Grundy	private	One of the most spectacular and outstanding examples of a pit cave in the United States.
5	Cumberland Caverns		1973	35°40′09″N 85°40′51″W / 35.669167°N 85.680833°W / 35.669167; -85.680833 (Cumberland Caverns)	Warren	private	Two interconnecting caves at least 27 miles (43 km) in extent.
6	Dick Cove		1973	35°13′40″N 85°57′19″W / 35.227839°N 85.955392°W / 35.227839; -85.955392 (Dick Cove)	Franklin	private	A near virgin forest
7	Grassy Cove Karst Area		1973	35°51′24″N 84°55′35″W / 35.856787°N 84.926373°W / 35.856787; -84.926373 (Grassy Cove)	Cumberland	private	One of the nation's best illustrations of karst development and underground drainage
8	The Lost Sea		1974	35°32′08″N 84°25′52″W / 35.535556°N 84.431111°W / 35.535556; -84.431111 (Lost Sea)	Monroe	private	Cavern system that includes the largest known underground lake in the country.
9	May Prairie		1974	35°27′01″N 86°01′20″W / 35.450232°N 86.022274°W / 35.450232; -86.022274 (May Prairie)	Coffee	state	Largest and best relict prairie remaining in Tennessee.
10	McAnulty's Woods		1973		Hardeman	private	Only known example in western Tennessee of the upland forests of the Mississippi Embayment
11	Piney Falls		1974		Rhea	state (Piney Falls State Natural Area)	Contains a rare virgin mixed mesophytic forest stand.
12	Reelfoot Lake		1966	36°23′20″N 89°23′20″W / 36.388889°N 89.388889°W / 36.388889; -89.388889 (Reelfoot Lake)	Lake, Obion	federal ( Reelfoot National Wildlife Refuge)	Mosaic of habitats formed as a result of the New Madrid earthquake,
13	Savage Gulf		1971	35°15′32″N 85°47′20″W / 35.259°N 85.789°W / 35.259; -85.789 (Savage Gulf)	Grundy	state (Savage Gulf State Natural Area)	A virgin forest.