In Michigan, a lake can rise nearly 30 feet inside Mystery Valley and later leave a grassy floor; water enters and exits through the same hidden sinkhole

In Michigan’s Presque Isle County lies the enchanting Mystery Valley, known for its lake that both disappears and reemerges in an ongoing spectacle. This captivating cycle is attributed to a unique underground drainage system coupled with a sinkhole. The valley was created when the land above underground voids collapsed, offering a striking view of karst topography.
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