In addition to wizards and witches, the Wizarding World is occupied by goblins, house-elves, centaurs, giants, dementors and various wild and pet magical creatures. The Harry Potter books primarily focus on aspects of the Wizarding World on the British Isles, but other regions with known magical communities include France, Bulgaria, and the United States, among several others. The Wizarding World has its own mail service utilizing owls.
The currency of the Wizarding World is in bronze, silver and gold coins called Knuts, Sickles and Galleons, respectively. Twenty-nine Knuts make a Sickle, and seventeen Sickles make one Galleon. Conversions between Muggle and Wizarding money do exist, but fanfic authors tend to ignore them and grossly under- or over-exaggerate the coins' values.