From the seasonal banner on the home page: “Did you know iNaturalist has observations from every inhabited country? You can support this global movement!”
Would iNaturalist please provide a list of the uninhabited countries? Maybe we’d like to go there.
They are territories claimed by Norway and France (respectively). On iNat all other territorial units are separated out too (e.g. Guam, Pitcairn Islands), but those are the only “unobserved” ones.