Fells are elevated areas of land, often characterized by rugged terrain and rocky outcrops. They are typically found in regions with a cooler climate and can be covered in grass, heather, or other vegetation. Fells are popular for outdoor activities such as hiking and climbing, attracting nature enthusiasts and adventurers. In the context of the Lake District in England, fells are prominent features of the landscape, with notable examples including Scafell Pike and Helvellyn. These areas provide unique ecosystems and habitats for various wildlife, making them important for conservation efforts and ecological studies.