This is a composite of parts of two topographic quadrangles  (Mikesville and High Springs, Fl) showing the course of the Santa Fe River. The river sinks in O'Leno State Park (arrow #1). From there it travels underground in caves and passageways to resurface at River Rise near the bottom of the map (arrow #2). Downing and Black Lakes (un-numbered arrows)are parts of the river's underground course where the roof of the passageways have collapsed, exposing the river briefly.
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