Question: Spike Island lies in the Sankey Canal at which river?

Context paragraphs:
Spike Island (Cheshire): Spike Island is an island between the Sankey Canal and the estuary of the River Mersey, part of Widnes in the Borough of Halton in north-west England.  The island contains parkland, woodland, a path along the canal and the Catalyst Science Discovery Centre, the only science museum in the UK solely devoted to chemistry.

Sankey Canal: The Sankey Canal, which is also known as the Sankey Brook Navigation and the St Helens Canal, historically entirely within Lancashire is a canal now in Cheshire, extending into Merseyside, in the northwest of England, connecting St Helens with the River Mersey at Spike Island.  When opened in 1757, it ran along the valley of the Sankey Brook from the point where the brook joined the Mersey, past Warrington to Parr at the north east of what became St Helens town centre.  Extensions were constructed at the Mersey end of the canal, firstly to Fiddlers Ferry and then to Widnes, while at the northern end, it was extended into Sutton, close to what became the centre of St Helens.  The canal was gradually abandoned between 1931 and 1963, but has been the object of a restoration attempt since 1985, when the Sankey Canal Restoration Society was formed.

Sankey Bridges: Sankey Bridges is part of the parish of Great Sankey in Warrington, a unitary authority in the north-west of England.  Located around the crossing of the main turnpike road between Warrington, Prescot and Liverpool over the Sankey Brook, it became home to many industries after the opening of the Sankey Canal, the first wholly artificial canal built in England during the Industrial Revolution.

Sankey Valley Park: Sankey Valley Park is a public park in Warrington, Cheshire.  It occupies part of the Sankey Valley and the main park itself covers over 1½ miles between Sankey Bridges in the south and Callands in the north.  The valley follows the course of Sankey Brook and the now disused Sankey Canal.  The park is enjoyed by walkers, cyclists and anglers and the central section of the park is family orientated with children's play features, a maze and lawned areas.  Bewsey Old Hall sits on the edge of the central section of the park and RAF Burtonwood lies one mile (1.6 km) to the west.  The Trans Pennine Trail passes around 500 yd from the southern tip of the park.

Urara Island: Urara Island is a small inhabited island in the northern part of Ataliklikun Bay (Bismarck Sea) in Papua New Guinea, located just off the mainland of the northern coast of New Britain.  There are 3 villages, the largest lying on the southern central part of the coastline.  Urara Island lies about 3 miles westward of Cape Liguan, and stands on a reef which extends a short distance only eastward of it and 1.5 miles to the westward.  Materbert Island lies about 6 miles west of the island and Watom Island lies to the north-east.

Sankey Bridges railway station: Sankey Bridges railway station was in southwestern Warrington, England.  It was located immediately west of a swing bridge over the Sankey Canal.  The station site is to the south of Old Liverpool Road, Warrington.

Fidlers Ferry &amp; Penketh railway station: Fidler's Ferry & Penketh railway station was on what is now the southwestern edge of Warrington, England.  It was located at a point where the St Helens and Runcorn Gap Railway, the Sankey Canal and the River Mersey come side by side and where a ferry at one time plied across the river.  In modern times the station site is at the southern, canal end of Station Road, Penketh.

Sankey Viaduct: The Sankey Viaduct is a railway viaduct at Bradley Lane, Collins Green, Burtonwood parish, Warrington Borough, crossing the Sankey Canal and Sankey Brook into Earlestown, Newton le Willows, Metropolitan Borough of St Helens, Merseyside.

Spike Island (film): Spike Island is a 2012 British comedy film, directed by Mat Whitecross.  It was distributed by Universal Pictures and Vertigo Films and produced by Revolver Entertainment.  The film is based on The Stone Roses' iconic gig on Spike Island in Cheshire, England, and follows the story of a group of friends who idolize the band and try to get into the gig, but are faced with problems because they do not have a ticket or a way to get there.  "Spike Island" was premiered on 11 October 2012 at the BFI London Film Festival and was released on DVD on 21 June 2013.

Spike Island, County Cork: Spike Island () is an island of 103 acres in Cork Harbour, Ireland.  Originally the site of a monastic settlement, the island is dominated by an 18th-century star fort named Fort Mitchel.  The island's strategic location within the harbour meant it was used at times for defence and as a prison.  Since the early 21st century the island has been developed as a heritage tourist attraction, with €5.5m investment in exhibition and visitor spaces and accompanying tourism marketing.  There were in excess of 10,000 visitors to the island during the month of August 2016.  Spike Island was named top European tourist attraction at the 2017 World Travel Awards.

Supporting paragraphs: Sankey Canal Spike Island (Cheshire)
Answer: River Mersey