Fillory is a magical land written about in Christopher Plover's novels that turns out to be real.
Fillory is populated with, among other things, talking animals such as horses and elephants (although the non-talking kind also exist), and other magical beasts, such as pegasi. There are also a number of unique animals. Its gods are the twin rams, Ember and Umber.
Fillory has four thrones, often vacant, but when all are filled, it has two kings and two queens, of which one is High King. These thrones cannot be occupied by someone from Fillory. Once the High King is married, he cannot leave Fillory or be with anybody else; he is forever bound to his wife.
Fillory is a land of abundance and as such, its monetary system is mostly symbolic. Anything that looks like it might be money seems to be accepted, be it gold or plastic game coins.
The world Fillory is situated on, is a disk, and as such, has an edge. On the other side of the disk is another land. Fillory, and presumably its world, cannot exist without magic.