Silvertear Skies plot hole

[MrThinker]

People keep talking as if the Mhachi were close enough to Silvertear Lake to seem to be encroaching on Midgardsormr's territory. When was this ever implied?

Mhach was in what is currently Yafaem Saltmoor, to the west of Mor Dhona. Not in Mor Dhona itself, as far as I'm aware - and there are no Mhachi ruins seen in the area.

I think people conflate Yafaem being a part of Mor Dhona due to it only being accessible in a raid whose theme can be considered a remix of Mor Dhona's theme + FFIX battle theme.

But yes, the Yafaem Saltmoor is technically it's own region, like Cartenau Flats and Xelphatol.