Most departments divide their department into three or four sub-disciplines: Human geography, Physical geography, Human-Environmental Interaction, and sometimes GIScience. They, of course, all overlap to a great extent and are internally heterogeneous, but it sounds like you are leaning towards human-environment. Depending on what exactly you want to do, you'll probably want to take some GIS courses, as its a strong methodological tool for any quantitative studies. Feel free to PM me if you have any more specific questions.