The natural is really hard to defend on this map.
|sc2nite||StarCraft 2 tonight?|
|WCS||StarCraft II World Championship Series|
|EPM||Effective actions per minute|
A term used in the RTS game StarCraft 2; refers to the next nearest location to your main base for which you can mine resources (minerals and vespene gas)--so it is the most "natural" place to expand your main base.