Volcanic barriers are natural formations created by the accumulation of volcanic materials, such as lava, ash, and rock. These barriers can take the form of ridges or mounds that influence the landscape and can affect local ecosystems. They often arise from repeated volcanic eruptions, where the materials build up over time. These barriers can also play a role in controlling the flow of water and sediment in an area. For instance, they may redirect rivers or create natural dams, impacting the surrounding environment. Understanding volcanic barriers is important for studying volcanoes and their effects on geography and ecosystems.