The people from the Flanaess call this new land Terra Anakeris Incognita.
You will find this continent on the main map of Oerth.
Kaboom, one of the secrets is out ... one or more of the Powers has come over here, and is conducting their research and development on this continent.
Their bases are NOT visible to your sky ships, Kaboom.
Wherever they are hiding on this new land, they are hiding well.
Scrying also fails to find their bases ... as you might have expected.
You now have a Power (or several Powers) to your south, as well as to your west, Kaboom.