Blackwater River (Massachusetts–New Hampshire)
The river forms in a salt marsh in the northeastern corner of Salisbury, Massachusetts, by the convergence of the Little River and Dead Creek. Heading north, the river quickly enters Seabrook, New Hampshire and continues to flow through salt marsh until it reaches Hampton Harbor, northwest of Seabrook Beach, where it joins the Hampton River.
- New Hampshire GRANIT state geographic information system Archived August 3, 2013, at the Wayback Machine
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