Pathestry (from "Path Astray") is a very large continent in the southern hemisphere of Kasw's Heart. It is where most of the story takes place.
It has 3 distinct regions; Celestaria, the Greyfold, and the Inderdark.
Celestaria, to the northeast was once a lush region with rolling plains and small forests, but was cursed to become a vast desert over time. The exception to this are parts of the frontier, and the Jandel province. It is named for the Celestarian Empire, although which name came first is debated. The empire is often called the Sunheart Empire instead.
The Greyfold, named for the thick fog and traces of volcanic smoke that perpetually cover it, stretches across the center of the continent. It is known for its forests, home to fantastically huge black trees. Much of the region can be considered a temperate rainforest.
The Inderdark is the most inhospitable region, for it is home to huge volcanos and is suffering from perpetual winter thanks to the cloud cover and its proximity to the southern arctic circle.
There is also a nearby subcontinent, Haven's Rest. It's separated from Pathestry by a relatively small stretch of ocean and is home to a large sea dragon nesting ground. It is populated primarily by the descendants of dragon refugees fleeing the wars and persecution they faced in Celestaria. Many of these descendants became sailors and pirates and returned to the mainland for trading opportunities.