United States of America
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.
Listen to the audio guide for Heron Pond â Little Black Slough Nature Preserve Free on WIP — starts by itself when you arrive, even with the screen off