Destination for a pleasant cycle ride this afternoon - about 34 miles, out along the Bridgewater Canal, back so far along the canal then along the Transpennine Trail.
Preston Brook is not far from Runcorn, and is the junction between the Bridgewater Canal (opened in the 1760s between Manchester and the river Mersey at Runcorn) and the Trent & Mersey Canal (opened in 1777 between here and Shardlow on the River Trent). Strictly the junction and change of ownership is just north of the tunnel mouth.
My railway friends will know that the adjacent West Coast Main Line (WCML) runs through the area, but with a rather shorter tunnel (78 yards instead of 1244 yards).