English: Map showing the area of NW Ohio and NE Indiana once covered by the Great Black Swamp.
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Self-made, based on USGS data. Note: The swamp boundaries shown on this map are consistent with those shown on the map, Changing Landscape - the Great Black Swamp, on the St. Joseph River Watershed Initiative's Western Lake Erie Conservation Assessment Project – St. Joseph River Watershed page: http://www.sjrwi.org/cp_5.
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