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Through Census and Petrochemical

The city has an important seaport with a depth of 15 m (49 ft), kept consistent along almost the entire length of the bay, where the Napostá Stream drains.

Bahía Blanca means "White Bay". The name is due to the color of the salt covering the local soil surrounding the shores. The bay (which is an estuary) was seen by Ferdinand Magellan during his first circumnavigation of the world on the order of Charles I of Spain in 1520, looking for a canal connecting the Atlantic to the Pacific Ocean along the coasts of South America.

History

The city was founded as a fortress on 11 April 1828 by Colonel Ramón Estomba on the orders of Brigadier-General and subsequent Governor of Buenos Aires, Juan Manuel de Rosas. It was initially named Fortaleza Protectora Argentina (Argentine Protective Fortress), built for the purpose of protecting inhabitants from cattle rustlers, and also to guard the coast against the Brazilian navy, which had landed in the area the previous year. It was visited by Charles Darwin during his travels through South America in September 1833. The fortress was attacked by Malones (incursions of nomadic aboriginals on horseback) several times, most notably in 1859 by 3,000 Calfucurá warriors. It became commercially important after the Buenos Aires Great Southern Railway linked the town to the city of Buenos Aires in 1885, facilitating the transport of grain from the Pampas.

The rapid growth of the local economy, the policy encouraging immigration from Europe, and the country's abundant natural resources attracted many immigrants, mainly from Spain and Italy, and a remarkable number from France, who settled in Pigüé, about 125 km to the north of the city. Another important foreign settlement close to the city was of Dutch settlers, in Tres Arroyos, located about 250 km northeast. Major groups of immigrants from Germany and Jews from Eastern Europe also arrived in the city and the region at the beginning of the 20th century, as well as during World War II and the post-war period.

European immigrants brought their customs and culture. There were at least five opera houses in Bahía Blanca at the beginning of the 20th century and six cinemas by 1920.

Puerto Belgrano, located 29 kilometres (18 mi) to the southeast, is Argentina's largest naval base. Its construction started with a secret decree signed by President José Evaristo Uriburu. It was designed and built from 12 May 1898 to 8 March 1902 by the Italian engineer Luigi Luiggi, and a Dutch company named Dirks, Dates & Van Hattem.

In March 2025, Bahía Blanca and neighboring towns were flooded by a 12-hour long rain. The estimated precipitation was 290 millimetres (11 in), being the most devastating rainfall in Argentina since 1975 and over half of the average annual precipitation in the city of 584 millimetres (23.0 in). The flood, preceded by unusually high humidity stretching across the north of the Patagonia region and the north of Argentina, left at least 16 deaths and hundreds of disappearances. The disaster prompted a national humanitarian effort; non-perishable food, hygiene elements, and cleaning supplies have been donated from across Argentina. President Javier Milei cancelled a trip to Chile, and the national government collaborated with Axel Kicillof, the governor of Buenos Aires Province and usually a political rival, due to the flooding. The Chilean government expressed its solidarity towards the victims, as did Volodymyr Zelenskyy, the president of Ukraine, during a phone call with President Milei. Elon Musk also announced that Starlink would offer free Internet services to Bahía Blanca residents for 30 days.

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