This document provides an overview of the key concepts in geography. It defines geography as the study of the Earth's physical environment and human habitat. There are two main branches: physical geography, which examines natural phenomena like mountains and oceans, and human geography, which studies human-environment interactions and patterns of culture. Geographers ask questions to understand locations, places, movement, and regions. The most important question is "why?". Key themes include location, place, human-environment interaction, movement, and regions.