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This National Natural Landmark has attracted curious visitors since the 1880s. This unique geological feature in the midst of the sandy North Florida terrain contains a miniature rainforest with gentle streams trickling down the sinkhole's 120-foot limestone walls.

Surrounded by quiet woods and huge trees, anglers can spend a relaxing afternoon fishing on the river. The Santa Fe River goes underground in O'Leno State Park and reemerges over three miles away in River Rise Preserve State Park before resuming its journey to the Suwannee River.