1. A spatial distribution of a species (group of interbreeding organisms that do not ordinarily breed with members of other groups): The geographic range of rattlesnakes, for example, is only located in the Western Hemisphere, in North and South America.

Arizona provides a geographic range for 13 different species of rattlesnakes.
2. The total area occupied by a population: Mr Straight asked the students to find out what groups of lifeforms would apply to the definition of geographic range.
3. The extreme distance at which an object or light can be seen when limited only by the curvature of the Earth and the heights of the object and the observer: The geographic range of light is dependent on the height of the light itself, the height of the observer's eyes, and the refraction of the atmosphere.