Fen Fields

Publisher's blurb:

This plains region is divided by a slow river that runs from southeast to northwest . The open plains are covered in tall grasses, while patchy woods and marshy ground flank the river-bottom lowlands. At night a vast croaking chorus fills the air. Rumors claim a giant multi-headed monster stalks the river-side swamps of the Fen Fields, and a wizard's ghost haunts the nearby tower.