Question: Water passes east via Nubanusit Brook to this River and flows in a northward direction?
Context: West Peterborough is an unincorporated community in the town of Peterborough in Hillsborough County, New Hampshire, United States.  It is located along Nubanusit Brook in the western part of the town.  Union Street leads 2 mi east to the Peterborough town center and 0.6 mi south to New Hampshire Route 101, a highway connecting Keene to the west with Milford to the east. Nubanusit Brook is a 14.3 mi stream located in southern New Hampshire in the United States.  It is a tributary of the Contoocook River, part of the Merrimack River watershed. Thorndike Pond is a 252 acre water body located in Cheshire County in southwestern New Hampshire, United States, in the towns of Jaffrey and Dublin.  The pond is located at the base of Mount Monadnock.  Water from Thorndike Pond flows north via Stanley Brook, then east via Nubanusit Brook to the Contoocook River, a tributary of the Merrimack River. Nubanusit Lake is a 718 acre lake located on the border between Cheshire and Hillsborough counties in southwestern New Hampshire, United States, in the towns of Nelson and Hancock.  The outlet of the lake is Nubanusit Brook, a tributary of the Contoocook River in the Merrimack River drainage basin. Roaring Brook (also known as Roaring Branch Creek or Roaring Creek and historically known as Nay-aug) is a tributary of the Lackawanna River in Lackawanna County, Pennsylvania, in the United States.  It is approximately 21 mi long and flows through Covington Township, Madison Township, Moscow, Roaring Brook Township, Elmhurst Township, Dunmore, and Scranton.  The watershed of the stream has an area of 56.3 sqmi .  Its named tributaries include Little Roaring Brook, Rock Bottom Creek, White Oak Run, Van Brunt Creek, Bear Brook, and East Branch Roaring Brook.  It has a high level of water quality for much of its length.  However, it is affected by abandoned mining land, stormwater, and other impacts in its lower reaches.  Reservoirs in the watershed include the Hollister Reservoir, the Elmhurst Reservoir, and others.  The stream also flows through the Nay Aug Gorge and passes over the Nay Aug Falls, which are on the National Register of Geologic Landmarks.  It flows through a concrete channel in its lower reaches.  The topography of the watershed contains rolling hills in its upper reaches and the mountainous land of the Moosic Mountains in its lower reaches. Harrisville Pond is a 138 acre water body located in Cheshire County in southwestern New Hampshire, United States, in the town of Harrisville.  It is one of many lakes and ponds along Nubanusit Brook, a tributary of the Contoocook River.  Water from Nubanusit Lake flows via the Great Meadows into the pond on the north side and out of the pond at two dams on the south side.  One dam allows the level of the pond to be raised or lowered and also adjusts the flow through the mills that span that part of the outlet, while the other dam is made of large stones and sandbags.  The village of Harrisville is located at the outlet of the pond. Skatutakee Lake is a 236 acre water body located in Cheshire County in southwestern New Hampshire, United States, in the town of Harrisville.  Water from Skatutakee Lake flows via Nubanusit Brook to the Contoocook River in Peterborough and ultimately to the Merrimack River. Jarama is a river in central Spain.  It flows north to south, and passes east of Madrid where the El Atazar Dam is built on a tributary, the Lozoya River.  It flows into the river Tagus in Aranjuez.  The Manzanares is a tributary of the Jarama. Fountain of the Great Lakes, or Spirit of the Great Lakes Fountain, is an allegorical sculpture by Lorado Taft in the Art Institute of Chicago South Stanley McCormick Memorial Court south of the Art Institute of Chicago Building in the Loop community area of Chicago in Cook County, Illinois, United States.  It is a bronze work of art created between 1907 and 1913.  The fountain depicts five women arranged so that the water flows through them in the same way water passes through the Great Lakes.  Note that the Great Lakes waterflow starts in Lake Superior at 600 ft above sea level and continues eastward through each lake until it reaches Lake Ontario and then passes into the St. Lawrence River.  The Fountain is one of Taft's best known works. The Contoocook River ( ) is a 71 mi river in New Hampshire.  It flows from Pool Pond and Contoocook Lake on the Jaffrey/Rindge border to Penacook (just north of Concord), where it empties into the Merrimack River.  It is one of only a few rivers in New Hampshire that flow in a predominantly northward direction.  Two picturesque covered bridges in Hopkinton and one in Henniker span the Contoocook, as does another on the Hancock-Greenfield line.  Residents and tourists have made the Contoocook popular for fishing and whitewater boating.
Answer: Contoocook River