Allerton Natural Area
Allerton Natural Area provides an example of the rapidly disappearing Illinois stream valley ecosystem. The site contains relatively undisturbed examples of bottomland and upland forests.
Year designated: 1970
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.