Landforms are natural features on the Earth's surface. There are many different types of landforms including mountains, hills, volcanoes, basins, valleys, canyons, plains, plateaus, lakes, coasts, peninsulas, and deltas. Major landforms also include mountains ranges, continental shelves, isthmuses, and cliffs. Bodies of water that help define landforms include oceans, seas, rivers, waterfalls, branches, mouths, canals, gulfs, bays, islands, archipelagos, fjords, and straits.