Canyons are deep, narrow valleys with steep sides, often formed by the erosion of rock and soil over time, typically by rivers. They can vary in size and shape, with some canyons being just a few feet deep while others, like the Grand Canyon, can reach depths of over a mile. The process of erosion, combined with weathering, plays a crucial role in shaping these natural formations. Canyons are often characterized by their unique geological features, including cliffs, rock layers, and sometimes waterfalls. They can be found in various environments around the world, from deserts to forests, and are popular destinations for outdoor activities such as hiking, rafting, and photography.