Puys are volcanic hills or mounds formed by the accumulation of volcanic material, such as ash and lava. They are typically found in regions with volcanic activity and can vary in size and shape. The term "puys" is often associated with the Auvergne region in France, where numerous examples can be seen. These geological formations are significant for studying volcanic processes and the Earth's history. Puys can also influence local ecosystems and landscapes, providing unique habitats for various plant and animal species. Their presence often attracts tourists and researchers interested in geology and natural history.