The middle island sinkhole sits on the edge of the lake Huron, a part of the Great Lakes in Michigan.  This sinkhole has been the object of several studies by NOAA (National Oceanic and Atmospheric Administration).  The sinkhole is also interesting in that it has a positive flow of ground water into the Huron lake.

Middle Island Sinkhole in Huron Great Lake, Michigan. Source: NOAA
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