State list for Fiji incomplete
In theory you could update this by yourself via SQL.  There are two arguments against this thought:


The ID won't match anyone else's Civi, which could lead to problems with third-party extensions.
This is a change that the rest of the community can benefit from.


I would file a ticket at issues.civicrm.org.  If you have the chops to create a Github pull request, great!  If not, no worries.  Please be sure to include a reference to sources showing the missing "State", such as https://en.wikipedia.org/wiki/Local_government_in_Fiji.