The Soul Society serves as the eternal resting place for the souls of the deceased in the Bleach universe. It is depicted as a feudal society with a hierarchical structure, reminiscent of traditional Japanese culture and architecture. The Soul Society is divided into various districts, each governed by a powerful soul reaper known as a captain.

The architectural design of the Soul Society reflects its traditional and spiritual nature, with structures such as temples, pagodas, and grand palaces dotting the landscape. The serene and tranquil atmosphere of the Soul Society contrasts with the chaos and danger present in other realms, symbolizing it as a place of peace and order.

However, beneath the surface, the Soul Society harbors secrets and political intrigue. It is not merely a realm of tranquility but also a battleground for power struggles and conflicts among the soul reapers. This dichotomy between its outward appearance and internal struggles adds depth to the Soul Society as a setting.

Hueco Mundo is the Deserted Hollow World of the Hollows

The Soul Society serves as the afterlife for souls in the Bleach universe, with the Eastern branch being the primary setting for most of the series. Governed by the Soul Reapers and Central 46, it is a realm where souls find peace and rest after death. The society is structured hierarchically, with powerful noble families, such as the Kuchiki and Shihoin clans, holding significant influence. Souls are escorted to the Soul Society by Soul Reapers, and they may spend their entire existence there or reincarnate into the world of the living.

The Rukongai District is the civilian sector of the Soul Society, characterized by varying levels of wealth and safety. It resembles pre-industrial Japan and serves as the home for most newly arrived souls. Despite the conservative nature of the Soul Society, efforts to modernize, such as introducing smartphones and human pop culture, have been made in recent times.

At the core of the Soul Society lies the Seireitei, a walled-off region housing the Gotei 13, the thirteen squads of Soul Reapers. It features traditional Japanese architecture and serves as the hub for Soul Reaper activities, including training at the Shin'o Academy and administration at Central 46. Notable locations within the Seireitei include Sokyoku Hill, where significant events such as Rukia's interrupted execution and Ichigo's final battle against Captain Byakuya Kuchiki take place.

In contrast, Hueco Mundo is the realm of Hollows and Arrancars, characterized by a barren desert landscape. It serves as a hostile environment where powerful beings reside, including the villainous Espada. Hueco Mundo stands in stark contrast to the tranquil and structured nature of the Soul Society, reflecting the chaotic and dangerous world of its inhabitants.

Hueco Mundo serves as the realm of Hollows and Arrancars in the Bleach universe, characterized by an endless desert of white sand and sparse mineral trees. It is a world of eternal night, devoid of hope and salvation, where its inhabitants live in despair and fear. The realm operates on a "might makes right" principle, with no formal government or hierarchy, and rulership is determined by power and charisma rather than elections or royal lineage.

The most prominent landmark in Hueco Mundo is Las Noches, a massive fortress-like structure that serves as the seat of power for whoever rules the realm. It is a sprawling complex with various buildings and palaces, including barracks for Sosuke Aizen's army of Arrancars. Each Espada, the top-ranking Arrancars, has their own palace within Las Noches, where they reside and conduct their activities. Despite its imposing appearance, Las Noches is not invulnerable, as demonstrated during the invasion by the Wandenreich in the Thousand-Year Blood War arc.

Hueco Mundo is a predatory environment where Hollows engage in cannibalism to grow stronger, preying on one another in their quest for power. It is also a place where weaker Hollows can evolve into more powerful forms, fueled by the abundance of prey and the absence of interference from Soul Reapers. Despite its self-contained nature, Hueco Mundo faced a significant threat during the Thousand-Year Blood War when the Wandenreich invaded, resulting in widespread devastation and the capture of prominent figures like Tier Harribel.

Silbern, the hidden headquarters of the Wandenreich, serves as the base of operations for the Quincy invaders during the Thousand-Year Blood War arc. It is a mysterious and formidable fortress, concealed from the eyes of their enemies. From Silbern, King Yhwach and his forces orchestrated their assault on the Soul Society and Hueco Mundo, posing a significant threat to both realms.

Silbern, introduced late in the Bleach story, served as the hidden fortress of the Wandenreich, or Quincy empire. This icy stronghold was concealed in a pocket dimension, making it virtually undetectable by other factions in the Bleach universe. Its existence was shrouded in secrecy until the Quincy launched their invasion of the Soul Society during the Thousand-Year Blood War arc, catching the Soul Reapers off guard.

As the primary military base of the Quincy, Silbern housed barracks for all Quincy forces, from standard troops to the elite Sternritter. It featured private quarters, including rooms for prominent Quincy such as Bambietta Basterbine, and ceremonial spaces like a throne room and assembly hall where King Yhwach could address his followers.

During the climactic battles of the Thousand-Year Blood War, King Yhwach manifested a new fortress called Wahrwelt, symbolizing his ambition to merge all realms into a deathless world. This grand palace served as the focal point of his plan to reshape reality, but it ultimately became the battleground where Ichigo Kurosaki and his allies confronted the Wandenreich's leadership to thwart their scheme.

By the conclusion of Bleach, both Silbern and Wahrwelt had been destroyed, and the Soul Society was restored to its former state. Silbern's fate remained uncertain, as it was no longer occupied by the Quincy empire and may have ceased to exist altogether following the events of the Thousand-Year Blood War. With the defeat of the Quincy and the restoration of balance to the spirit realms, the Soul Society and Hueco Mundo remained the primary domains in the Bleach universe, while Silbern faded into history.