Stillwater River (Ohio)
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The Stillwater River is a tributary of the Great Miami River, approximately 65 mi (105 km) long in western Ohio in the United States.
It rises near the Indiana state line, in western Darke County approximately 10 mi (16 km) northwest of Greenville. It flows east-southeast and is joined by the Greenville Creek approximately 5 mi (8 km) west of Piqua. It flows south past Covington and Englewood, where it is dammed for flood control, then southeast to join the Great Miami in Dayton.