Blackwater River (Massachusetts–New Hampshire)

The Blackwater River is a 3.1-mile-long (5.0 km) tidal inlet in northeastern Massachusetts and southeastern New Hampshire in the United States.[1]

Blackwater River
The Seabrook Nuclear Power Station, as seen across the Blackwater River in Seabrook
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Location
Country	United States
States	Massachusetts, New Hampshire
Counties	Essex County, MA; Rockingham County, NH
Towns	Salisbury, MA; Seabrook, NH
Physical characteristics
Source
• location	Salisbury, MA
• coordinates	42°52′0″N 70°49′22″W
• elevation	0 ft (0 m)
Mouth	Hampton Harbor
• location	Seabrook, NH
• coordinates	42°53′20″N 70°49′38″W
• elevation	0 ft (0 m)
Length	3.1 mi (5.0 km)

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.