Choose the geographic theme represented below.

The United States is north of Mexico and south of Canada.

location

human-environmental interaction

movement

regions

Well I would go with location because it sounds like the geographic theme you are explaining

location

Explanation:

Considering that in geography the location is the place where something is located or the action and effect of locating (locating, locating or installing in a certain place or space), we can affirm that the geographic theme represented is a location, because the example locates geographically the US in North America.