[Astromancer]

Try this idea. A storm blows a ship off course on a voyage from Araterre to Azer and discovers new lands. a group of large (Iceland/Ireland sized) islands with a climate like northern Spain or southern France. These islands seem to be in an area of rich fishing.

Exploring and settling such islands would be a lively campaign.

I see the Manna level as Normal in most places with small areas of high manna.