The River Blakewater with the Cob Wall Viaduct
|location||Lancashire , England|
|River system||River Ribble|
|Drain over||River Darwen → River Ribble → Irish Sea|
|River basin district||North West|
|origin||east of Blackburn
|muzzle||in the River Darwen
The River Blakewater is a watercourse in Lancashire , England . It arises in the east of Blackburn and flows partially underground through the city to the west to flow into the River Darwen in the west of the city .