Blackwater River (Massachusetts–New Hampshire) facts for kids

Quick facts for kids Blackwater River
The Seabrook Nuclear Power Station, as seen across the Blackwater River in Seabrook
Show map of New Hampshire Show map of Massachusetts Show map of the United States
Country	United States
States	Massachusetts, New Hampshire
Counties	Essex County, MA; Rockingham County, NH
Towns	Salisbury, MA; Seabrook, NH
Physical characteristics
Main source	Salisbury, MA 0 ft (0 m) 42°52′0″N 70°49′22″W / 42.86667°N 70.82278°W / 42.86667; -70.82278
River mouth	Hampton Harbor Seabrook, NH 0 ft (0 m) 42°53′20″N 70°49′38″W / 42.88889°N 70.82722°W / 42.88889; -70.82722
Length	3.1 mi (5.0 km)

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.

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.