A gorge is a narrow valley with steep, rocky walls, often formed by the erosion of a river over time. These natural formations can be found in various landscapes around the world and are typically characterized by their dramatic cliffs and deep channels. Gorges can vary in size, from small ravines to large canyons. Many gorges are popular for outdoor activities such as hiking, rock climbing, and photography. Famous examples include the Grand Canyon in the United States and the Colca Canyon in Peru. Gorges often host unique ecosystems, providing habitats for various plants and animals adapted to their specific environments.