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The Great Black Swamp, or simply Black Swamp, was a glacially-caused wetland in northwest Ohio, United States, extending into extreme northeastern Indiana, that existed from the end of the Wisconsin glaciation until the late 19th century. It comprised extensive swamps and marshes, with some higher, drier ground interspersed, and occupied what was formerly the southwestern part of Glacial Lake Maumee, a holocene precursor to Lake Erie. It was gradually drained and settled in the second half of the 19th century and is now highly productive farm land.