Footprint

Footprint is the term given to the space taken up by a particular tower. The size of a tower's footprint is usually dependent on its power. Stronger towers usually have a larger footprint while the weaker towers usually have a smaller footprint.

Strategies
The size of the footprint can alter the strategies when trying to place strong towers on small pieces of land or water, where some towers cannot possibly rest on the part of the land or water.

(insert more information about how to deal with the footprint)

Trivia

 * This is an official term as seen in the Bomb Shooter's Monkey Knowledge Card of Ranks 3, 8 and 13. It says "Footprint reduced by 5%/10%/15%" respectively.