National Natural Landmarks

Big Hollow

Big Hollow
Big Hollow

Big Hollow is a 40-square mile wind deflation basin scoured out by high winds during a prehistoric dry period. The hollow represents a classic case of "topographic reversal" and is the largest demonstrable example of its type in the 48 contiguous states. The site has typical natural wind-swept high altitude vegetation and examples of salt- and selenium-tolerant species.

Location: Albany County, WY ; Albany County, WY

Year designated: 1980

Acres: 12,862

Ownership: Federal, Private

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Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.

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