Fillory is the magical world created by Ember and Umber, as well as the setting of the Fillory and Further series by Christopher Plover. The name Fillory is used to describe both the land mass and one of the sovereign states, the other being Loria. Fillory hosts the Wellspring, the source of all magic, and serves as the prison for the beast created by the Old Gods.
To be added
The planet known as Fillory was once a distant, wild little world before being chosen by the Old Gods to be a prison for an abomination they had created. It would later be be remodeled by the twin ram deities, Ember and Umber to create a whimsical world by flipping the land over and starting over on the other side.