Arnside Knott is a hill with a summit elevation of 159 metres, near Arnside, Cumbria, England. Although it is in South Lakeland district it is not in the Lake District National Park, lying south of the River Kent which forms the south eastern boundary of the national park. It is within the Arnside and Silverdale Area of Outstanding Natural Beauty, and is National Trust …Arnside Knott is a hill with a summit elevation of 159 metres, near Arnside, Cumbria, England. Although it is in South Lakeland district it is not in the Lake District National Park, lying south of the River Kent which forms the south eastern boundary of the national park. It is within the Arnside and Silverdale Area of Outstanding Natural Beauty, and is National Trust property.