Deleting an advertising Zone will not delete the advertisements in that zone. The advertisements in that zone will no longer be assigned to a zone, and they will no longer appear on your site. If an Ad is in a Zone, and the Zone is deleted, you must place the Ad in a new Zone for it to appear on the site.
To delete an advertising Zone:
Click Zones under Advertising in the administration menu.
The following page will display the list of zones.
Check the box in the red delete column next to each Zone you wish to delete.
Click the Delete button at the top or bottom of the list.
On the following page, you may uncheck any of the items that you do not wish to delete. To finally delete the checked zones:
Click the Delete button at the top or bottom of the list.
A confirmation page will appear with a link back to the list of Zones.