Flatrock Creek is a 57.2-mile-long (92.1 km)[1] tributary of the Auglaize River[2] in northeastern Indiana and northwestern Ohio in the United States.
It drains a primarily rural farming area in the watershed of Lake Erie.
[3] The creek flows northwest from Ohio into eastern Allen County, Indiana, then turns northeast at Monroeville, Indiana and flows into Paulding County, Ohio, past Payne and Paulding.
It joins the Auglaize from the west approximately 10 miles (16 km) southwest of Defiance at 41°10′34″N 84°26′27″W / 41.1761604°N 84.4407815°W / 41.1761604; -84.4407815.
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