Spirit World


 * ''This article is about the place. For the episode with a similar name, see "Winter Solstice, Part 1: The Spirit World".

The Spirit World is a parallel plane of reality that coexists alongside the mortal world, and is home to the spirits, immortal supernatural entities which often embody different aspects of life and nature. All past lives of the Avatar reside in the Spirit World.

It is very difficult and extremely rare for a human, other than the Avatar, to enter the Spirit World; conversely, only a handful of spirits are able to exist physically in the mortal world and they must give up their immortality to do so. The Spirit World and the physical world are closest together during the solstices, which makes it possible for spirits to manifest in the mortal world and for humans to pass into the Spirit World. There are also certain locations in the physical world which act as bridges to the Spirit World; these locations are often revered by the cultures living near them, such as the Spirit Oasis in the North Pole. The Avatar acts as a spiritual bridge between both worlds and can travel between them freely, though bending has no effect in the Spirit World.

There are few known ways for a mortal to enter into the Spirit World, though humans are sometimes carried there by a spirit as the entity shifts between planes. The Avatar is able to pass fully into the Spirit World at times when and locations where the barrier separating the two realities is unusually weak, such as at Avatar Temples on a winter solstice or at the Spirit Oasis at the North Pole.

Overview
Very little is known about the Spirit World, particularly its geography. However in certain places, the landscape of the Spirit World seems to conform closely to an area of the physical world, to the extent where a mortal making the transition might not immediately take notice of the difference. In other places, the geography of the Spirit World has no relation to the physical world and the two settings vary considerably.

Realm of Koh


The lair of the spirit Koh, the Face Stealer, lies below a gigantic, twisted tree. The land surrounding his covert is barren, dark, and scarcely inhabited, except for Koh's faceless victims and at least one gargantuan wolf. For anyone who enters his lair it is advisable to remain emotionless, as Koh steals the face of anyone who expresses their emotions in front of him.

Forgetful Valley


Situated in the Fire Nation, the Forgetful Valley is comprised of thick wilderness and four mystical, crystal-clear pools of water. Occasionally, a wolf spirit will drink from one of the four pools. The valley is home to the Mother of Faces, whose presence is clear upon observing the various fauna and flora which exhibit face-like markings.

Solstices
A solstice is an astronomical event that occurs twice a year. During these solstices, the Spirit World and the physical world are significantly closer to each other compared to the rest of the year. Therefore, during one of the solstices, it is somewhat easier for one to cross into the Spirit World. Aang took advantage of this during the winter solstice to talk to Avatar Roku about Sozin's Comet. Avatar Roku also used the winter solstice sun to aid him in entering the Avatar State.

Spirit Oasis


The Spirit Oasis is a verdant oasis located in the Northern Water Tribe at the base of a waterfall behind the chief's temple. It is the center of all the spiritual energy in the entire North Pole and, unlike the rest of the region, has a warmer climate able to facilitate the growth of vegetation. Two koi fish swim in a central pool of the oasis and are the mortal forms of Tui and La, the Moon and the Ocean Spirits. Under normal circumstances, if one sets foot in the pool it acts normal. However, sometimes it can open as a portal to the Spirit World, and even be used to drag people nearby it to the Spirit World.

The Avatar
The Avatar is the natural bridge between the Spirit World and the physical world. The Avatar can use meditation to enter the Spirit World. When doing so, the spirit of the Avatar leaves his or her physical body defenseless.

Known spirits
The entities of the Spirit World are classified into four categories: light spirits, dark spirits, creature spirits, and human spirits, which includes the past lives of the Avatar and the Painted Lady. There is a special relationship between light and dark spirits, as one cannot exist without the other.


 * Avatar Aang: The Air Nomad Avatar before Avatar Korra. He was tasked with the duty of defeating the Fire Lord and restoring balance to the war-stricken world. After his decisive victory over Fire Lord Ozai, he began a romantic relationship with his close friend, Katara of the Southern Water Tribe. The two eventually married, culminating with the birth of their three children, Kya, Bumi, and Tenzin. Aang passed away peacefully of old age.
 * Avatar Kuruk: A Water Tribe Avatar from the North Pole who is in constant pursuit of Koh. He was a laid-back and easy-going Avatar who flirted with girls and liked to show off his bending prowess. This eventually led to his downfall in life when his true love was stolen by Koh as punishment for his carefree attitude.
 * Avatar Kyoshi: An Earth Kingdom Avatar hailing from Kyoshi Island, who was a tough and adamant Avatar. She founded the Dai Li to ensure the protection of Ba Sing Se's cultural heritage. She dealt with the likes of the 46th Earth King and Chin the Conqueror.
 * Avatar Roku: The Fire Nation Avatar who acted as a guide and mentor to Aang throughout his journeys. He was once a friend of Sozin; however, they became enemies after Sozin began to seek world domination, and Sozin later left his friend to die from the poisonous gases of a volcanic eruption. Roku's decision to spare Sozin following a conflict in the Earth Kingdom was a major cause of the Hundred Year War. Roku married Ta Min and was a friend of Monk Gyatso, Aang's former guardian and airbending instructor.
 * Avatar Yangchen: A female Air Nomad Avatar from the Western Air Temple who advised Aang in defeating Fire Lord Ozai. A devout Avatar, she was willing to forsake her spiritual customs to ensure peace and safety in the world.
 * Dark spirits: Reside in the icy tundra deep beneath the South Pole, and have displayed the ability to manipulate fire. One of these entities confronted Avatar Korra.
 * Fang: Roku's dragon who died along with Roku during the volcanic eruption that destroyed his village.  He can now communicate telepathically with people from the mortal world and give them insight on the Spirit World. As a spirit, Fang is intangible and invisible.
 * Hei Bai: Typically taking the form of a panda bear, he manifests himself as a ferocious monster when provoked. A spirit of a dense forest near Senlin Village, Hei Bai retaliated when the Fire Nation destroyed his home. Later, he aided Aang during his journey in the Spirit World.
 * Knowledge Seekers: Fox-like spirits that assist Wan Shi Tong by gathering old books and parchments to compile more information.
 * Koh, the Face Stealer: An ancient, malicious spirit that steals the face of any creature who shows emotion in his presence. As one of the oldest spirits in existence, he is extremely knowledgeable and possesses the ability to predict future events. Avatar Kuruk holds a grudge against him and attempted to kill him for capturing his fiancée, Ummi.
 * Mother of Faces: A giant woman with various blank faces encircling her head, she has the ability to give someone a new face. She appears in the Forgetful Valley after her wolf spirit has drank from one of the pools, and it is there she will give her gift of a new face.
 * Odd monkey spirit: A perverse monkey-like spirit that spends his time meditating.
 * Painted Lady: The spirit of the Jang Hui River, located in the Fire Nation, where villagers worship and build statues of her in her honor. She expressed her gratitude to Katara for fulfilling her duties after she fled Jang Hui because of the surrounding river's pollution. The Painted Lady is known to possess healing and spiritual abilities.
 * Princess Yue: After Tui was killed by Admiral Zhao, Princess Yue sacrificed her life to revive the Moon Spirit, consequently gaining waterbending abilities. Because of her father's prior exchange with Tui, she has become the reincarnation of the original Moon Spirit.
 * Tui and La: Near the beginning of the world's creation, the Moon and Ocean Spirits departed for the mortal world and manifested themselves as two koi fish in the sacred Spirit Oasis of the North Pole. Tui and La were the original waterbenders, with La being the source and Tui being the originator.
 * Unnamed fire Avatar: A powerful Fire Nation Avatar who could trigger the Avatar State at will and use it to lavabend.
 * Wan Shi Tong: Wan Shi Tong brought his immense library of knowledge into the mortal world in the hopes of bettering mankind with wisdom. With the use of fox-like animals known as Knowledge Seekers, he seeks out valuable sources of knowledge, varying from scrolls to ancient tomes. The library, located in the Si Wong Desert, was freely available to all until mortals used the knowledge to further warfare, prompting Wan Shi Tong to bury the library beneath the sand and making the library impossible to find. He typically takes the shape of a gigantic black-and-white barn owl, but when angered becomes a wyvern-like creature.
 * Wolf spirit: A giant, ferocious wolf spirit with a prominent image of a face on its chest, which Aang's face morphed into when feeling its presence. This spirit stopped Team Avatar when they attempted to enter Hira'a. It can swallow fire and throw up moth wasps.

Known visitors

 * Avatar Aang
 * Avatar Korra
 * Avatar Kuruk
 * Avatar Kyoshi
 * Avatar Roku
 * Avatar Wan
 * Avatar Yangchen
 * Iroh
 * Jinora
 * Sokka
 * Three villagers from Senlin Village
 * Ummi, the betrothed of Avatar Kuruk
 * Unnamed fire Avatar
 * Zei

Trivia

 * There are no bathrooms in the Spirit World.
 * Some spirits have the ability to alter humans; in one instance during Wan's time, a man was changed to have treelike traits.