The River Duddon is a river located in the Lake District National Park in northwest England. It flows for approximately 16 miles, starting from the Duddon Valley and emptying into the Irish Sea at Duddon Sands. The river is known for its scenic beauty, surrounded by mountains and lush landscapes, making it a popular spot for walkers and nature enthusiasts. The Duddon Valley is rich in wildlife and offers various recreational activities, including fishing and kayaking. The river is also famous for its historical significance, as it has inspired poets like William Wordsworth, who wrote about its beauty in his works.