Café de Nuit

Where is Rokushima suppose to be in regard to the mainland?

Given that they're separated by the Mists, Rokushima could be located anywhere when compared to the Core.
To the left, to the right, above, below, even overhead or underneath. Until and unless Rokushima ever joins the Core -- maybe if the Poison Sea and either the Nocturnal Sea or the Sea of Sorrows ever fuse -- there's just no telling.

In my Mistworld, the Rojushima Taiyo Islands are on the far east, part of the Verdours Land Continent.

rpgcasey wrote:Where is Rokushima suppose to be in regard to the mainland?

Canonically an "island of terror" domain, isolated from all others except by mist travel.

S- would have encountered it in the same Gazetteer as Farelle and I'Cath.