The Merriam-Webster Dictionary defines geography as "a science that deals with the description, distribution and interaction of the diverse physical, biological and cultural resources of the earth's surface." (For our purposes, this includes the features of the earth's crust located under bodies of water as well.)
This means that geography is a very broad area of study. It encompasses landforms (think mountains, valleys, plateaus, caves) as well as bodies of water (think oceans, seas, and rivers). Geography also includes the arbitrary, human-made distinctions and delineations we draw on our maps. Country borders, for instance. The location of cities within countries (and with respect to the landforms) and the characteristics of these cities. All those invisible, straight lines that you see drawn on a globe such as longitude lines, latitude lines, the Equator and more.
How well acquainted are you with the planet we live on? Can you name the biggest deserts and the deepest oceans? What about the largest country or most populated city? Do you know where the Great Barrier Reef is, or how many animal species live in the Amazon Rain Forest? If you don't, take this quiz! You'll soon have mountains of geographic knowledge under your belt.