Lava plains are flat, expansive areas formed by the flow of lava from volcanic eruptions. These regions are characterized by their smooth, often basaltic surfaces, created when lava spreads out over large distances before cooling and solidifying. The formation of lava plains typically occurs during effusive eruptions, where lava flows steadily rather than explosively. These landscapes can be found in various parts of the world, including the Columbia River Basalt Group in the United States and the Icelandic lava fields. Lava plains are important for studying volcanic activity and can also support unique ecosystems adapted to the harsh conditions of volcanic rock.