A Flow Map, as defined by Phan in 2005, is a map that shows the movement of objects from one location to another. According to Harris in 1999, flow maps have the ability to show the movement of both tangible as well as intangible things, such as this map pictured here, which displays the telecommunication traffic between European countries. The flow of communication is depicted through the red lines, and the thickness of the lines is proportional to the number of minutes of voice communication the respected countries engage in which each other, measured in millions of minutes. This particular map is identified as a part of the new branch of geography and cartography known as telegraphy, which studies the mapping of voice and electronic data.
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