The Douglas Navigation was a canalised section of the River Douglas or Asland, in Lancashire, England, running from its confluence with the River Ribble to Wigan. It was authorised in 1720, and some work was carried out, but the undertakers lost most of the share money speculating on the South Sea Bubble. Alexander Leigh attempted to revive it eleven years later, and opened it progressively between 1738 and 1742. Leigh began work on a parallel canal called Leigh's Cut to improve the passage from Newburgh to Gathurst, but progress was slow and it was unfinished in 1771.