The Ocean that between Uladh and Iria...

I'm not sure if it is present in English/NA, but there are trace references of an oriental continent east of Iria in item descriptions, exploration quest dialogue, NPC keyword responses, etc. It may be referring to that?

It was also eluded to (in KR only) that Professor J comes from a place other than Uladh, and assumingly not meaning Belvast or Iria. Although, this may also be interpreted as being a kingdom other than Ulaid/Aliech but still in Uladh. Though I doubt this is related to the oriental area at all because his uniform looks German in inspiration.

The C2 developer was going to make an oriental area but he had to go before he could work on it,so he half-assed it by making Nekojima.

The C3 developers were planning to release this Oriental area in G13, a lot of the models are present in the data. Some of these files were later used by the C4 team in G14 by some Homestead props, and later some were put into Doki Doki Island.

Is that all he says? It is possible it is just another reference to this place east of Iria, though no way of telling without more information.