Original sentence: Close to the hamlet of.It rises at a point 1289.Seathwaite the Tarn Beck from Seathwaite Tarn is subsumed.The catchment area of the River Duddon includes a substantial part of the.The river descends to the sea over a course of about 15 miles (24 km) before entering the Irish Sea at the Duddon Sands.The section of the river downstream.feet (393 m) above sea level near the Three Shire Stone at the highest point of Wrynose Pass ().from Seathwaite is popular with canoeists and is graded as 3 with some easy 4''.south-western Lake District fells, including the eastern slopes of Corney Fell, Ulpha Fell and Harter Fell; the southern slopes of the mountains around the head of Langdale, and the western slopes of Dunnerdale and Seathwaite Fells
Edited sentence: Close to the hamlet of Seathwaite the Tarn Beck from Seathwaite Tarn is subsumed.It rises at a point  above sea level near the Three Shire Stone at the highest point of Wrynose Pass ().The catchment area of the River Duddon includes a substantial part of the south-western Lake District fells, including the eastern slopes of Corney Fell, Ulpha Fell and Harter Fell; the southern slopes of the mountains around the head of Langdale, and the western slopes of Dunnerdale and Seathwaite Fells.The river descends to the sea over a course of about  before entering the Irish Sea at the Duddon Sands.The section of the river downstream from Seathwaite is popular with canoeists and is graded as 3 with some easy 4''