This List is managed and maintained virtually by Fusion and it does npt exists within SharePoint.

When you retrieve the List, Fusion is generating the Site Hierarchy relative to the Connection URL. Each Item in the List is equal to one site in the Site Collection.

Use cases:
Retrieve the Subsite hierarchy for export or input to Site CRUD actions.
Create New Sites based on standard or custom templates. (Creating an Item creates a Site)
Delete Sites (cascading). (Deleting an Item deletes the Site)
Update the Title or Description columns for a Site. (Updating an Item Updates a Site)

Read more about SharePoint Site Provisioning from Fusion

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