Just 15 miles south of Minneola, Highway 283 bisects the Big Basin, a natural sinkhole thought to have been created by dissolving salts a few thousands years ago dropping the surface 100 ft. The highway traverses 1.04 miles through the basin before climbing to the rim, which has nearly vertical walls. The entrance to the Big Basin Prairie Preserve lies in the bottom of the basin, which is home to a free roaming buffalo herd. Visitors are urged follow the unimproved road to St. Jacob’s Well, but to use caution when exiting their vehicles as these animals are unpredictable.

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