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Republic City is the capital city of the United Republic of Nations as well as one of the largest and most modern cities in the world. Located on the shores of Yue Bay, it is built upon what was once the territory of a Fire Nation colony and was founded by Fire Lord Zuko and Avatar Aang after the conclusion of the Hundred Year War as a haven for immigrants from all across the four nations. Being a modern urban center, Republic City boasts significant high-rise development as well as the widespread use of automobiles, motorcycles, and airships.
Republic City is home to a variety of iconic landmarks. These include a monumental statue of Avatar Aang in Yue Bay, a spacious city park, many suspension bridges, and skyscrapers. The police force utilizes metalbending for civil law enforcement. Pro-bending is the city's most popular form of sporting.
- Yue Bay
- Dragon Flats borough
- Industrial areas
- Republic City underground
- Other locations
- Notable figures
In the aftermath of the Hundred Year War, Team Avatar, led by Avatar Aang and Fire Lord Zuko, came to an agreement with Earth King Kuei on the establishment of the Harmony Restoration Movement, which would return the Fire Nation colonies to the jurisdiction of the Earth Kingdom. One of the procedures of this action was the relocation of Fire Nation citizens from the foreign settlements they had created over the past century. This order of removal had negative demographic consequences not considered by any of the parties to the agreement. A year into the operation of the movement, Zuko withdrew his support after being accused of being a traitor by his own people, precipitating a confrontation with his friend, the Avatar.
After a narrow avoidance of war, Aang and Zuko eventually resolved this impasse by not removing the Fire Nation colonies, but regulating the balance of power by creating a fifth nation separate from the original four. This new nation would be a society open to anyone from the four nations to reside in and be governed by a council with representatives from each of the four nations. They named this unique sovereignty the United Republic of Nations and established Republic City as its capital at a valley in the northwestern Earth Kingdom.
 <p class="caption">Republic City's skyline during the day.
In contrast to the other major cities of the world, Republic City is a true metropolitan urban center. The city has developed the architectural and technological sophistication to construct taller buildings, resulting in significant high-rise development. Stylistically, the city generally incorporates traditional ornamentation with far more advanced structural techniques, such as the design of City Hall and the Pro-bending Arena. Despite this, there are still landmarks built entirely in a traditional style, such as Air Temple Island. Beneath the city there is an extensive tunnel network. The metropolitan area is divided into many boroughs.
 <p class="caption">Downtown during the day.
The bustling center of the city, downtown, is reminiscent of all the different elemental bending traditions in both its architecture and its population. In downtown Republic City, tall, well-crafted buildings line the cobblestone streets, and a railroad track sits elevated above the roadway, offering transportation to those wishing to explore the city. This sector is representative of a cultural melting pot of shops and stands featuring goods from all three nations. It is the political, economic, and cultural center of Republic City, protected by a massive police presence operating from their headquarters and airships. Despite this security, downtown suffers from organized crime as much as the remainder of Republic City. The Triple Threat Triad, the largest bending triad of the whole city, claims the downtown area is their turf and runs protection rackets throughout it.
- Main article: City Hall
City Hall is a center for governance in Republic City, and secondarily a venue for public press conferences and gatherings, which are held at the large square before its front entrance. It is here that Avatar Korra made her first official appearance to the city's inhabitants. While the building has an entrance typical of traditional architecture from the Earth Kingdom or Fire Nation, certain distinctive features, including the large dome and four spires at the corners, are derived from a new style developed after the Hundred Year War.
- Main article: Kwong's Cuisine
- Main article: Police headquarters
The police headquarters, often referred to simply as "Headquarters", is the base of operations for the metalbending police, and also where apprehended criminals are booked and jailed. The architecture of the police headquarters is comparable to that of standard Earth Kingdom buildings, with both the exterior and the interior being largely geometrical in design. Headquarters is overseen by Chief Lin Beifong. On the Headquarters' facade stands a statue of Toph Beifong.
 <p class="caption">Republic City port during the day.
Republic City's port hosts a significant amount of international commercial traffic, and serves as the terminal for a cargo steamship line to the Southern Water Tribe. Automobiles are brought to the port and loaded onto the ships, on which they are taken regions across the world. The area has road access as well as a railroad line. Several wooden piers extend into Yue Bay, some of which have structures constructed above them. One of these buildings exhibits Earth Kingdom architectural features, having brown sides, a green roof, and a dome. In addition to foreign steamers, the port also serves as a terminal for the Air Temple Island ferry. A suspension bridge is built above the area.
- Main article: Republic City Park
Located in the city's central peninsula, Republic City Park is landscaped with small hills, deciduous trees shading impeccably kept grass, and fine stone arch bridges. Due to the poverty of a large number of Republic City citizens, the city park has also become a place popular with vagabonds such as Gommu, whom Korra met soon after her initial arrival in the city. Fishing in the ponds here is strictly prohibited by the park officials, who patrol it to ensure that all civilians bide by this rule.
- Main article: Aang Memorial Island
Aang Memorial Island is a small islet off the coast of Yue Bay, located near Air Temple Island. It features a massive statue of a teenage Avatar Aang created by the Fire Nation some years after the end of the Hundred Year War for display in the bay of Republic City, where it would stand as a symbol of peace and goodwill. Aang is depicted in Air Nomad attire, with the accompanying necklace he wore when Fire Lord Zuko announced the war's end at his coronation.
- Main article: Air Temple Island
Located in Yue Bay, Air Temple Island is the home of Tenzin and his family, some of the most important figures in Republic City. The temple was originally built by Avatar Aang himself. Comprised of several unique facilities, including a tall tower with boasting traditional architecture, several smaller dormitories with blue roofs, and an open training area, Air Temple Island is also the residence of the Air Acolytes, who serve to carry on the customs of the now-extinct Air Nomad civilization.
- Main article: Pro-bending Arena
Pro-bending is the most popular sport in Republic City, and official pro-bending matches are held in the city's Pro-bending Arena. As a testament to the sport's popularity, this building has a golden appearance and is lit at night, making it a prominent city landmark. The arena is spacious enough to hold the pro-bending ring on which the contestants compete, a large pool of water far below the ring, and seating for the great number of spectators that attend each game. The arena is one of Republic City's most renowned cultural marvels, and people from all over the world come to visit and watch the world's greatest benders compete.
After the Pro-bending Tournament was completed, the Equalists attacked this arena, leaving the roof and the pro-bending ring heavily damaged. Following the attack, in which the championship team was stripped of their bending by Amon, the arena was closed indefinitely. However, within the six months following the end of the Equalists' revolution, the arena was re-opened, allowing pro-bending matches to resume.
- Main article: Dragon Flats borough
The Dragon Flats borough is one of Republic City's many residential sectors. It is known for being Hiroshi Sato's birthplace and an active triad territory. Before a successful raid by Councilman Tarrlok's task force, it hosted an underground training facility for Equalist chi blockers. Due to continued Equalist activity in the area, its residents were for a brief amount of time put under a curfew, which was unsuccessfully resisted by nonbenders.
- Main article: Chi blocker training camp
The chi blocker training camp was a secret Equalist facility used for instructing nonbenders on chi blocking. It was hidden in a secret cellar underneath a bookstore, and was successfully invaded by Tarrlok, Korra, and the remainder of the task force. Several people who had been participating in Equalist activities at the time were captured by the task force and arrested.
 <p class="caption">This is one of many industrial areas in Republic City.
- Main article: Rally building
The rally building is a large convention hall formerly operated by the Equalists. It is located near an industrial sector of Republic City's waterfront, at the intersection of two minor roadways and is the place where Amon's revelation rally was held.
- Main article: Republic City power plant
The Republic City power plant is the main source of electricity for the city. It is operated by firebenders through the use of lightning generation. According to Mako, the pay for the job is decent.
- Main article: Republic City tunnel network
The Republic City tunnel network is a system of subterranean passages located underneath Republic City. It is a heavily complex network of tunnels, but upon first glance, the system seems to be largely unused. However, due to growing unrest among the citizens of Republic City, it had at one point become the primary site of operations for Equalist activity. During this time, the tunnel network hosted Equalist prisons, training camps, and garages.
- Main article: Central City Station
Central City Station is the city's main hub of transportation, though in recent years, it has hosted less ridership due to the advent of the Satomobile. Nonetheless, it remains a busy commercial center, which is symbolized by the monumental statue of Fire Lord Zuko at its front entrance.
- Main article: Southern Water Tribe Cultural Center
The Southern Water Tribe Cultural Center is a cultural center in Republic City hosting cultural activities. It acts as an immigration for the Southern Water Tribe. A statue of Sokka marks the building. A protest was held in front of the center to convince President Raiko to aid the Southern Water Tribe against the Northern invaders.
- Main article: Harmony Tower
The Harmony Tower is a tall lattice structure located north of the downtown area that allows citizens to see a clear, panoramic view of Republic City.
- Main article: Narook's Seaweed Noodlery
Narook's Seaweed Noodlery is a restaurant in the Little Water Tribe neighborhood of Republic City. It serves traditional Southern Water Tribe cuisine, and its noodles are advertised as the best in the United Republic.
- Main article: Silk Road Bridge
- Main article: Triple Threat Triad headquarters
The Triple Threat Triad headquarters is the base of operations for the Triple Threat Triad, Republic City's most notorious organized crime faction. It is disguised as a restaurant and located on a minor roadway near Central City Station.
- Main article: Cabbage Corp
Cabbage Corp is a leading automobile manufacturer. One of its most popular models is the Cabbage Car, a cheaper and more compact alternative to vehicles produced by Future Industries, the company's main rival. Cabbage Corp's current owner is Lau Gan-Lan.
- Main article: Future Industries
Future Industries is a manufacturing company founded by Hiroshi Sato and led by his daughter, Asami. Using state-of-the-art technology and the assembly line, the factory is able to produce over a hundred luxury Satomobiles on a daily basis. Although the automotive industry is where the company primarily does its business, it has the resources to also manufacture weapons and airplanes. Despite high demand, Future Industries' only known competitor is Cabbage Corp.
The population of Republic City is large by world standards, and the mass influx of immigrants from the four nations has caused considerable demographic challenges. The foremost of these challenges is inequality: the gap in wealth is considerable. Newcomers to the city appear unaware of these phenomena until their arrival, when they are presented with a considerable surprise. The Avatar herself believed its citizens to all be "living it up" and was shocked to discover vagabonds in the city park. With these difficult conditions, the populace seems ready to be stirred into a revolt against the perceived bending elite. A protester expended relatively little effort in arousing anger in a crowd against an annoyed Korra.
As the center of commerce throughout the nations, organized crime appears to be very common in Republic City. Gangs such as the Triple Threat Triad lay claim to certain boroughs of the city, which they call "territories". In these areas, the control of triads appears to be considerable, with shopkeepers forced to pay them in order to secure their safety. This power over local business is significant considering the regular and frequent airship patrols by the city's police forces.
The use of modern transportation methods such as automobiles, motorcycles, and airships is widespread in Republic City. The city also has invested considerably in advanced transportation infrastructure, with feats of engineering such as an elevated mass transit system and several suspension bridges connecting the city center with its outlying boroughs.
- The concept of Republic City is inspired by several real world past and present locations from the late 1800s to the 1930s. This includes Shanghai circa 1920s, Hong Kong, and Western cities such as New York, Chicago, and Vancouver. In particular, the statue of Aang in Yue Bay, Republic City Park, and the Silk Road Bridge are inspired by the Statue of Liberty, Central Park, and the Brooklyn Bridge, respectively, in New York City.
- The rapid urbanization and technological advances of the World of Avatar mirrors that of the late nineteenth century and early twentieth century in the real world, in which automobiles, towering buildings, trolleys, and other great engineering feats came to be.
- The park in Republic City resembles Hyde Park in London, with its "Speaker's Corner", where anyone can stand up and speak to the public. In Republic City Park, a man is speaking to the public with a megaphone about the Equalists' views against benders.
- Similarities can also be traced with other European landmarks; the Harmony Tower is reminiscent of Paris' Eiffel Tower, and City Hall closely resembles Berlin's Reichstag.
- The city is divided into boroughs. The only one known is the Dragon Flats borough, home of Hiroshi Sato's family.
- Of the six members of the original Team Avatar, four of them are known to have statues located in Republic City.
- Republic City is located near Makapu Village and Taku.
- The elevated railway transportation can be compared to the elevated railway system, or EL, built in Chicago during the early 1900s, and the street trolley system can be compared to San Francisco's street trolleys also built during the early 1900s.
- Tarrlok's seizing of control of major law operations and using the police to oppress nonbenders makes Republic City appear to operate like a police state, just as Ba Sing Se was before the end of the Hundred Year War.
- It appears that during the time of Yakone's trial, Republic City's citizens were still using animals for transportation, as evidenced by the lack of motor vehicles and Yakone utilizing an ostrich horse carriage as a method of escape.
- In "And the Winner Is...", a Cabbage Corp advertisement on the radio describes the company as "Republic City's trusted name in technology for over fifty years". This would mean that Republic City was, to some extent, up and running by 120 AG, a mere twenty years after the end of the Hundred Year War.
- In the German dub of The Legend of Korra, Republic City is called "Republica"; in the Greek dub, it is called "Democracy City"; and in the Dutch dub it is called "Republicasia".
- Republic City has three newspapers, two of which are The Elemental Times and The Republic Reporter.