I'm trying make my mod lore-friendly, so I wondered:

Is there anything (Besides Atmora) northeast of Tamriel?

Depending upon its size, one could reasonably hit Akavir by going in a north-easterly direction.

___TWM

Well, would there be enough room for say, A large, spread-out group of islands?

Depends on what you mean by "large."

Large as in a good fraction of the size of Tamriel (ie -- Summerset Isles)? Probably not, at least not something undiscovered. Large as in a lot of tiny islands? Actually, there probably already are, with human princes on them too, if you read into http://www.imperial-library.info/obbooks/ionith.shtml.

Well, it isn't undiscovered and as for the size, I'd say about the size of Summerset.

I doubt it.

There's no lore. Make up a continent if you want.

Disaster at Ionith was already posted.
It mentions small islands that the invasion fleet used to hop across to Akavir.

I've never seen these islands on a map before, but there is proof they are out there.

But I highly doubt they are very sizeable.

A small chain of islands each roughly the size Stros M'Kai?