Ribbon Reserved Position
This position should only be used for the horizontal navigation.
Banner Reserved Position
This position should only be used if needed for the site banner.
Top
The top position appears above both the content, sidebar and right rail.
Sidebar Reserved Position
This position should only be used for the sidebar navigation.
Breadcrumb Reserved Position
This position should only be used for the breadcrumb module.
Upper
The upper position appears above the content but not above the sidebar or the right rail if one exists.
Content
This is where the main joomla content appears.
Lower
The lower position appears below the content but not below the sidebar or the right rail if one exists.
Bottom
The bottom position appears below both the content, sidebar and right rail.