Regions are sections of your page where additional content can be added using Blocks. Regions vary based on the theme and should be a major consideration when choosing a theme. The following diagram outlines the basic regions for the YaleSites Standard Theme.
All Omega Regions
The image below outlines all the regions that are part of the Omega 3 Theme which is the foundation for YaleSites Templates. Many of the regions listed are not exposed by default since they are more frequently used in Custom Site building. Additional layouts can be created by exposing and rearranging these regions using Deltas. (click to enlarge image).