This document discusses key geographic features. It identifies important categories of geographic features as water-related and land-related. It provides examples of different types of landforms like mountains, hills, plains, gulfs, rivers, lakes, islands, and plateaus. It also defines geographic terms like lake, river, gulf, bay, mountain, hill, plain, island, peninsula, plateau, and tributary. Finally, it discusses how geographic features are important in United States history in relation to patterns of trade, locations of cities and towns, westward movement, and agriculture and fishing industries.