Default Hierarchy and Zones
Consider Default Hierarchy and Zones as different structures which coexist and share
the same enterprise node. The following diagram shows the relationships
between the two:

Figure - Default Hierarchy and Zones

Note:
The EMC hierarchy selector shows a Default System View folder at the same level as the highest zones. This folder is displayed in EMC to group the location records which are located under the enterprise. There is no node in the hierarchy structure for that folder.