Overview
Wonderland is the setting for Lewis Carroll's 1865 children's novel Alice's Adventures in Wonderland.
Geography
In the story, Wonderland is accessed by an underground passage, and Alice reaches it by travelling down a rabbit hole. While the location is apparently somewhere beneath Oxfordshire, Carroll does not specify how far down it is, and he has Alice speculate whether it is near the center of the Earth or even at the Antipodes.
The land is heavily wooded and grows mushrooms. There are well-kept gardens and substantial houses, such as those of the Duchess and the White Rabbit. Wonderland has a seacoast, where the Mock Turtle lives.
Government
The land is nominally ruled by the Queen of Hearts, whose whimsical decrees of capital punishment are routinely nullified by the King of Hearts. Other kings and queens are mentioned as their guests, and are implied to be the kings and queens of the other card suits. There is at least one Duchess.
From Wikipedia (CC BY-SA 4.0).