Question: The 39 mi long river which flows through the Irwell Valley in North West England and forms the boundary between Manchester and Salford meats what other river at Waterfoot, Lancashire?
Sentence (from "Manchester Exchange railway station"): The main approach road ran from the end of Deansgate near Manchester Cathedral, passing over the River Irwell and Chapel Street; a second approach road led up from Blackfriars Road.
Relevant evidence: No