A valley is a low area of land between hills or mountains, often formed by the erosion of soil and rock over time. Valleys can be created by various natural processes, including the movement of glaciers or the flow of rivers. They are typically characterized by their V-shape or U-shape, depending on how they were formed. Valleys can be found all over the world and are important for agriculture, as they often contain fertile soil and access to water. Many valleys, such as the Great Rift Valley in East Africa or the Yosemite Valley in California, are also known for their stunning natural beauty and biodiversity.