Everglades National Park
Throughout the Everglade sloughs are small islands formed from limestone, called hardwood hammocks. These islands are long and narrow, shaped somewhat like a tadpole when viewed from an airplane. They are aligned with the direction of flow of the water through the slough, as if they were tadpoles swimming upstream. This photo was taken at the Otter Cave Trail in the Shark Valley area. Caves sometimes form under the limestone on the hammocks. You can see a cave opening just to the right of Julie's feet. It is a couple of feet deep and may extend for several feet in each direction. The entire area under where Julie is standing is more or less hollow.