|District||District of Avantana|
|• Type||Mayoral Council|
|• Body||Ayuntamiento de Porta Tranquila|
|• Mayor-General||Anita Juaniméz (Chivalric Caucus)|
|• City Municipality||628 km2 (242 sq mi)|
|Elevation||4 m (13 ft)|
|• Urban||3,820,922 (2,019)|
|• Metro||4,503,290 (2,019)|
|Area code(s)||+861 (ATR) + 082 (Porta Tranquíla)|
Porta Tranquíla is the largest city in Antora. It has a population of 3,802,922 and a metropolitan population of nearly 4.5 million. It is the largest city in the country both in terms of area and population and is the capital of the Avantana district. The city proper covers 134.3 km2 while the entire metropolitan area covers 682 km2, taking up a good portion of the Duchy of Costa Tranquíla. The city is located on the coast of Novaris, bordering the North Concordian Ocean. The city was founded in the 4th century by Impelantic colonists, making it one of the oldest continuously inhabited settlements in Antora. Its fertile surroundings, attractive strategic location, and expansive harbor made it a highly-sought after city to control. The Kingdom of Avantana made it the capital and court of their monarchs for three hundred years, and it served for four hundred more years as the capital of the Kingdom of Casilló. While the capital was moved to Eleçeron in the late 1500s, Porta Tranquíla remains the important cultural and economic hub of the nation. Many regional and national government bodies are located here, such as the Antoran Shipping Authority, the Antoran Maritime Heritage Concern, and the Royal Antoran Fisheries Trust. The Mayor-General of Porta Tranquíla currently is Anita Juaniméz of the Chivalric Caucus.
Split into three parts by the diverging Ourá River, the Porta Tranquíla metropolitan area is a heavy mixture of modern, classic, and medieval architectural styles. Thanks to the scale of its transport infrastructure, the city is the busiest container port and railway hub on the Antoran coast, followed closely by Porta Armada. The standards of living in Porta Tranquíla are often measured as the highest in the nation. Placing a high importance on blending economic output with healthy work-life balance, many successive city administrations have constructed parks, entertainment complexes, and invested in the conservation of existing natural spaces. A major export of the area is orange-based products, such as jams, juices, and flavorings. Porta Tranquíla is home to the Guillermo y Aníta Lluvio Arts and Cultural Park, a thirty-acre shopping, music, theatre, movie, waterpark, and metro transit complex. Other destinations of note are the Tranquil Beaches, the 14th-century Temple of the Righteous Vow, the Royal Antoran Cultural Museum, and the shopping districts of Playa Major.