Landforms are natural features on Earth's surface including mountains, valleys, plateaus, canyons, plains and islands. Mountains are the tallest landforms with peaks, valleys are low areas between mountains, and plains are flat, expansive surfaces. Canyons are deep valleys with steep walls, while plateaus are flat highlands raised above the surrounding terrain. Bodies of water like oceans, rivers and lakes also shape the planet. Oceans are the largest water features, rivers are long flowing streams, and lakes are inland water surrounded by land.