Question: The hamlet Ashton is part of a city located on what river?

full_context: Document 1: Castle Ashby: Castle Ashby is the name of a civil parish, an estate village and an English country house in rural Northamptonshire. Historically the village was set up to service the needs of Castle Ashby House, the seat of the Marquess of Northampton. The village has one small pub-hotel, The Falcon. At the time of the 2011 census, the parish's population (including Chadstone) was 111 people. The village contains many houses rebuilt from the 1860s onwards. These include work by the architect E.F. Law of Northampton, whose work can also be seen nearby at Horton Church. The castle is the result of a licence obtained in 1306, for Walter Langton, Bishop of Coventry, to castellate his mansion in the village of Ashby.
Document 2: Ashton, Ontario: The small village of Ashton is located about 40 km southwest of Ottawa, Ontario, Canada, at the intersection of Ashton Station Road and Flewellyn Road. Ashton Station Road runs through the centre of the community, and serves as the south-western boundary line for the City of Ottawa, thus making the eastern half of the hamlet part of Ottawa, and the western portion part of Lanark County. The eastern half of the community was originally part of Goulbourn Township, which was amalgamated into the City of Ottawa in 2001. It is home to approximately 200 residents.
Document 3: North Lincolnshire: North Lincolnshire is a unitary authority area in the region of Yorkshire and the Humber in England. The population of the Unitary Authority at the 2011 census was 167,446. For ceremonial purposes it is part of Lincolnshire. There are three significant towns: Scunthorpe (the administrative centre), Brigg and Barton-upon-Humber.
Document 4: Norwich: Norwich ( , also ) is a city on the River Wensum in East Anglia and lies approximately 100 mi north-east of London. It is the regional administrative centre for East Anglia and county town of Norfolk. From the Middle Ages until the Industrial Revolution, Norwich was the largest city in England after London, and one of the most important.
Document 5: St Peter's Church, Walpole St Peter: St Peter's Church is an active Anglican parish church located in Walpole St Peter, Norfolk. One of the largest churches in the county, it is known as "the Cathedral of the Fens". It lies in the Diocese of Ely. The largely Perpendicular building is Grade 1 listed, and is often regarded as one of England's finest parish churches. It is said to be a favourite of Prince Charles, and John Betjeman described it as "the finest of all". It was also listed as one of Songs of Praise's favourite churches in Britain.
Document 6: Peterborough: Peterborough ( ) is a cathedral city in Cambridgeshire, England, with a population of 183,631 in 2011. Historically part of Northamptonshire, it is 73.6 mi north of London, on the River Nene which flows into the North Sea 30 mi to the north-east. The railway station is an important stop on the East Coast Main Line between London and Edinburgh.
Document 7: Peterborough Cathedral: Peterborough Cathedral, properly the Cathedral Church of St Peter, St Paul and St Andrew – also known as Saint Peter's Cathedral in the United Kingdom – is the seat of the Anglican Bishop of Peterborough, dedicated to Saint Peter, Saint Paul and Saint Andrew, whose statues look down from the three high gables of the famous "West Front". Although it was founded in the Anglo-Saxon period, its architecture is mainly Norman, following a rebuilding in the 12th century. With Durham and Ely Cathedrals, it is one of the most important 12th-century buildings in England to have remained largely intact, despite extensions and restoration.
Document 8: Holme, Cambridgeshire: Holme is a village and civil parish in Cambridgeshire, England. Holme lies approximately 7 mi south of Peterborough, near Conington and Yaxley. Holme is situated within Huntingdonshire which is a non-metropolitan district of Cambridgeshire as well as being a historic county of England. The parish contains the lowest point in Great Britain, 2.75 m below sea level.
Document 9: Ashton, Cambridgeshire: Ashton is a hamlet in the English county of Cambridgeshire. It falls within Bainton civil parish, part of the city of Peterborough unitary authority.
Document 10: East Coast Main Line: The East Coast Main Line (ECML) is a 393 mi major railway link between London and Edinburgh via Peterborough, Doncaster, Wakefield, Leeds, York, Darlington and Newcastle, electrified along the whole route. Services north of Edinburgh to Aberdeen and Inverness use diesel trains. The main franchise on the line is operated by Virgin Trains East Coast.
Document 11: Ashton, Devon: Ashton is a civil parish in the Teignbridge district of Devon, England. According to the 2001 census it had a population of 174, and it had a population of 203 according to the 2011 census. The parish consists of two villages, Higher Ashton and Lower Ashton, and is on the edge of the Dartmoor National Park. The France Brook flows through most of Ashton just south of its main road, and along Ashton's eastern boundary flows the River Teign. The parish is located approximately 13 km north of Newton Abbot, and roughly 10 km to the south west of its nearest city, Exeter. Historically, Ashton has primarily been based inside the agricultural sector, but one of its most notifiable landmarks is the St John the Baptists church located in the Higher Ashton district.
Document 12: Cambridge: Cambridge ( ) is a university city and the county town of Cambridgeshire, England, on the River Cam approximately 50 mi north of London. At the United Kingdom Census 2011, its population was 123,867, including 24,488 students.
Document 13: Ely, Cambridgeshire: Ely ( ) is a cathedral city in Cambridgeshire, England, about 14 mi north-northeast of Cambridge and about 80 mi by road from London. Æthelthryth (also known as Etheldreda) founded an abbey at Ely in 673; the abbey was destroyed in 870 by Danish invaders and was rebuilt by Æthelwold, Bishop of Winchester, in 970. Construction of the cathedral was started in 1083 by a Norman abbot, Simeon. Alan of Walsingham's octagon, built over Ely's nave crossing between 1322 and 1328, is the "greatest individual achievement of architectural genius at Ely Cathedral", according to architectural historian Nikolaus Pevsner. Building continued until the dissolution of the abbey in 1539 during the Reformation. The cathedral was sympathetically restored between 1845 and 1870 by the architect George Gilbert Scott. As the seat of a diocese, Ely has long been considered a city; in 1974, city status was granted by royal charter.
Document 14: Asterton: Asterton is a hamlet in Shropshire, England in the civil parish of Myndtown. The name means "eastern home farm", from Old English "east" "east" and "ham" "home". It is thought to date back to early Saxon times. It is situated 4 miles south west of Church Stretton, 6 miles north west of Bishops Castle, 15 miles north west of Ludlow and 17 miles south of Shrewsbury, the county town of Shropshire. The nearest other settlements are Prolly Moor, Wentnor, Ratlinghope, Myndtown and Little Stretton.
Document 15: Hilton, Cambridgeshire: Hilton is a village and civil parish in Cambridgeshire, England. Hilton lies approximately 11 mi north-west of Cambridge. Hilton is situated within Huntingdonshire which is a non-metropolitan district of Cambridgeshire as well as being a historic county of England. The parish adjoins the parishes of Elsworth, Fenstanton, Hemingford Abbots, Hemingford Grey, Papworth Everard and Papworth St Agnes. The parish church is dedicated to St Mary Magdalene and has a peal of six bells. Historically the village was in Huntingdonshire for over a thousand years until 1974.
ground_truth: River Nene