It is a nonsensical realm populated by humans, talking animals and plants, and other magical beings. Laws of physics don't always make sense in Underland.
In Tim Burton's Alice in Wonderland, Underland is true name for the world Alice Kingsleigh once referred to as "Wonderland", but it is revealed that she misheard the name as "Wonderland" when she was a child.
Underland is a far more nonsensical world than the one Alice remembered, and it has a solid geography, divided between many regions, including Marmoreal (southeast), Crims (centre north), Witzend (west), Iplam (centre west), Queast (east), Snud (south), and the Outlands (far west). The Crimson Sea is situated directly north of Underland.
Down the Rabbit HoleThis entrance is located on the Ascot family property, in a rabbit hole in the ground by a tree nearby the mansion. If someone falls in the hole, it will lead them to the Round Hall in Underland. The hole is stuffed with furniture of many sizes, from small table lamps, a bed, and even a piano; some furniture is positioned on the walls of the hole, while others are just floating in midair.
Through the Looking GlassSimilar to the rabbit hole entrance, the looking glass is also located in the Ascot family property, but inside the mansion itself, in Lord Ascot's old office. If someone passes through the wall-hung mirror over the fireplace, it will lead them to a mirrored office in Underland.
Marmoreal RegionQueen Mirana lives, along with her court and army. Its architecture seems to be inspired by the pieces and the board of a chess game, and it seems to be entirely built of marble, with a predominant white color. The castle is surrounded by tall waterfalls, and large gardens.
Tarrant Hightopp's House
Located near the White Queen's castle, the house of Tarrant Hightopp rests atop a cliff surrounded by waterfalls and green mountains. The entire house is modeled to resemble a top hat.
Salazen Grum is the castle and former home of Queen Iracebeth, who lived there with her court, servants, and army. The castle seems to be entirely built from stone, with red as a predominant color. It had gardens with many red roses and hedges cut into the shape of the Red Queen herself. After the Red Queen's reign ended, she was banished to the Outlands, and the castle fell to ruin.
Gummer Slough/The Chess Board
On the Frabjous Day, this large chess board served as the battle ground for the final clash between the armies of the White and Red Queens'. It was also here where Alice Kingsleigh slayed the Jabberwocky.
This town was ruled by Iracebeth and Mirana's parents, King Oleron and Queen Elsemere. The region was populated mostly by humans, though some talking animals lived here as well. It was the original home of the Mad hatter himself, Tarrant Hightopp, his family, and their hat shop. The entire town and surrounding forest was burned to the ground by the Jabberwocky during the Horunvendush Day (the day the Red Queen took control of Underland), and is currently abandoned.
Witzend CastleThis castle was located in the Witzend Town and the home of King Oleron and Queen Elsemere and the childhood home of the princesses Iracebeth and Mirana.
House of the March Hare
Located in the Tulgey Wood, the House of the March Hare is a windmill in ruins. This place was once surrounded by lush trees and beautiful flowers, but is now a gloomy wasteland. This is where Tarrant Hightopp, Thackery Earwicket, Mally, and Chessur enjoy each others company by drinking tea and eating cakes. Alice Kingsleigh visited this place when she first came to Underland when she was a child, and again when she was a young adult.
An untamed land to the very far west of Underland. After being banished from Underland, the Red Queen built an organic army and castle here.
Located in a pocket dimension inside Underland, this is where Time lives. A gigantic, grim, dark, and uninviting castle which has a predominant black color. When seen from the sky, the building itself seems to act like a clock, with three gigantic hands (seconds, minutes and hours) protruding from it and pointing to giant roman numerals. There is an abyss separating the castle and the outside lands.
The Ocean of Time
The Ocean of Time is the place where anyone who possesses the Chronosphere can travel back in time. Its waves reflect moments of the past, and crashing the Chronosphere in it will take the one who is controlling it to travel back to the determined moment.