I don't need an extensive knowledge of geography to study history. I don't need to know much about Waterloo in a geographical sense except for its rough location, and key features of the battle site, which any half-decent historical narrative (or whatever) of the battle will describe in adequate detail. I don't need to know the layout of Paris, or whence and wither the Seine runs to study the French Revolutions. In fact, beyond the basics (which, again, should be included in the history texts if necessary), I don't need to know any French geography. If I know Paris is the capital of France, and that France is in Western Europe, and that France is just across the English Channel, I have enough geographical knowledge to get started with the history of the French Revolutions.
When learning history, where to start is open to debate; however, IMO it is a good idea to be able to give one's own honest, educated answer to the following questions:
- What is history?
- Why do I want to learn history?
- Which of the different methods of studying and writing history do I most agree with?