Indian Stream is a tributary of the Connecticut River, approximately 19.1 miles (30.7 km) long,^[1] in New Hampshire in the United States. It rises in the mountains of extreme northern New Hampshire, in Coos County near the Canada–United States border, where the East Branch of Indian Stream joins the West Branch. Indian Stream flows south-southwest, joining the Connecticut 2 miles (3 km) downstream from the village of Pittsburg.

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Indian Stream
Map showing the Republic of Indian Stream (1832–1835) with Indian Stream near center of the green area
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Location
Country	United States
State	New Hampshire
County	Coos
Town	Pittsburg
Physical characteristics
Source	Confluence of East and West Branches
• location	Pittsburg
• coordinates	45°12′9″N 71°20′14″W
• elevation	1,420 ft (430 m)
Mouth	Connecticut River
• location	Pittsburg
• coordinates	45°2′32″N 71°26′33″W
• elevation	1,158 ft (353 m)
Length	19.1 mi (30.7 km)

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The area around Pittsburg was the subject of a border dispute in the 1830s between the United States and Canada, leading to the short-lived, self-proclaimed Republic of Indian Stream. The border dispute, based upon an ambiguity in the Treaty of Paris (1783), was resolved in 1842, with the river drainage and the land lying east of Halls Stream established as part of the state of New Hampshire.

• List of New Hampshire rivers