The document defines and provides examples of various landforms and bodies of water, including plains, plateaus, isthmuses, peninsulas, canyons, coves, harbors, gulfs, tributaries, and deltas. It notes that plains are low-lying and level or gently sloping areas that may or may not have trees. Plateaus are elevated plains with steep sides. Isthmuses are narrow strips of land bordered by water that connect two larger land areas. Peninsulas are areas of land almost completely surrounded by water on three sides.