Stony Brook is a 10.6-mile-long (17.1 km)  river located in southern New Hampshire in the United States. It is a tributary of the Souhegan River, which flows to the Merrimack River and ultimately to the Gulf of Maine.
Stony Brook rises in the town of Greenfield, New Hampshire, on the northern slopes of North Pack Monadnock Mountain. It flows southeast through the town of Lyndeborough, reaching the Souhegan in the mill town of Wilton.
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
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