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Heron Pond - Little Black Slough Nature Preserve (also known simply as Heron Pond) is a parcel of protected wetland property located in Belknap, Illinois, approximately 5 miles (8 km) southwest of Vienna, in Johnson County. It was designated a National Natural Landmark in 1972. As part of the Cache River basin, it is classified as a wetland of international importance under the Ramsar Convention.
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