Question: Fort Wentworth in the southwestern New Hampshire town Northumberland is located at the junction of what two rivers?
Context: Fort Wentworth was built by order of Benning Wentworth in 1755.  The fort was built at the junction of the Upper Ammonoosuc River and Connecticut River, in Northumberland, New Hampshire, by soldiers of Colonel Joseph Blanchard's New Hampshire Provincial Regiment including Robert Rogers.  In 1759, Rogers' Rangers returned here hoping for resupply after their raid on St. Francis, Quebec, but the fort had no garrison and no supplies.  Rogers had to travel down the Connecticut River to Fort at Number 4 for reinforcements and supplies for his hungry men. Spofford Lake is a 732 acre water body located in Cheshire County in southwestern New Hampshire, United States, in the town of Chesterfield.  Water from Spofford Lake flows via Partridge Brook to the Connecticut River.  In 2005 the New Hampshire Fish and Game Department named it the cleanest lake in southwestern New Hampshire, despite the amount of motor boating.  The village of Spofford is located at the lake's outlet. William Wentworth (1616–1697) was a follower of John Wheelwright, and an early settler of New Hampshire.  Coming from Alford in Lincolnshire, he likely came to New England with Wheelwright in 1636, but no records are found of him in Boston.  When Wheelwright was banished from the Massachusetts Bay Colony for his role in the Antinomian Controversy, he established the settlement of Exeter, New Hampshire, and Wentworth followed him there and then to Wells, Maine.  After Wheelwright left Wells for Hampton, New Hampshire, Wentworth went to Dover, New Hampshire, and this is where he lived the remainder of his life.  He was the proprietor of a sawmill, and held several town offices, but is most noted for being an elder in his Dover church for nearly 40 years.  He had 11 children with two wives, and has numerous descendants, including many of great prominence. Northumberland is a town located in southwestern Coos County, New Hampshire, U.S., north of Lancaster.  It is part of the Berlin, NH–VT micropolitan statistical area.  As of the 2010 census, the town population was 2,288, of whom 1,118 lived in the village of Groveton. Two Rivers High School is a public high school for students in grades 7 through 12 located in Ola, Arkansas, United States.  Two Rivers High School is administered by the Two Rivers School District.  The Two Rivers High School and school district serves 650 sqmi of rural communities including Ola, Plainview, Rover, and Casa.  Two Rivers High School is one of four high schools within Yell County and the sole high school administered by the Two Rivers School District. The Two Rivers Light (also known as the Two Rivers North Pierhead Light) is a lighthouse formerly located at the harbor entrance to Two Rivers, Wisconsin.  It is now located in a museum in the city. Two Rivers High School is a high school located in Two Rivers, Wisconsin.  It was built in 2001 to replace the former Washington High School in downtown Two Rivers.  The School is located at 4519 Lincoln Avenue Wisconsin Highway 42 on the outskirts of Two Rivers.  The school athletically takes part in the Eastern Wisconsin Conference.  Conference rivals include Plymouth High School and Kiel High School.  A total of 24 Credits and 20 Community Service Hours are required in order to graduate from the school. The Mark Wentworth House, also known as the Gov. John Wentworth House, is a historic house at 346 Pleasant Street in Portsmouth, New Hampshire.  The 2-1/2 story wood-frame mansion was built in 1763 by Henry Appleton, a merchant, who sold it to Mark Hunking Wentworth, one of New Hampshire's wealthiest merchants and landowners, the following year.  Wentworth's son John was appointed Royal Governor of New Hampshire in 1767, and occupied the house from then until his departure on the eve of the American Revolutionary War in 1775.  Despite the governor's occupancy, Mark Wentworth transferred the property to his daughter Anna Fisher in 1770.  It was sold out of the Wentworth family in 1797, and repurchased by Ebenezer Wentworth in 1810.  In the early 1900s Wentworth descendants adapted the property for use as an elder care facility, a role it continues to serve today. The River Tyne is a river in North East England and its length (excluding tributaries) is 118 km .  It is formed by the confluence of two rivers: the North Tyne and the South Tyne.  These two rivers converge at Warden Rock near Hexham in Northumberland at a place dubbed 'The Meeting of the Waters'. Two Rivers Press is an independent publishing house, based in the English town of Reading.  Two Rivers Press was founded in 1994 by Peter Hay (1951–2003), a local artist.  Its name reflects his enthusiasm for the town and its two rivers, the Kennet and the Thames, and its intention to explore "the place where art and history meet".  The name also gives a clue to the origins of the company in the, ultimately successful, opposition to Reading's proposed "Cross-Town Route", a road scheme that would have seriously impacted the point at which the two rivers meet.
Answer: Upper Ammonoosuc River and Connecticut River