A mill pond is any body of water used as a reservoir for a water-powered mill. Mill ponds were often created through the construction of a mill dam across a waterway. In many places, the common proper name Mill Pond name has remained even though the mill has long since gone. It may be fed by a man-made stream, known by several terms including leat and mill stream.
The term mill pond is often used colloquially to refer to a very flat body of water. Witnesses of the loss of RMS Titanic reported that the sea was "like a mill pond".[1]