Why is Buenos Aires Avenue so wide?

Buenos Aires' Grand Avenue: A City Block Wide

06/10/2025

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In the heart of Buenos Aires, Argentina, lies a thoroughfare unlike any other. Avenida 9 de Julio, or the "9th of July Avenue" in local parlance, isn't merely a street; it's a monumental statement of urban planning. Boasting an astonishing nine lanes of traffic, separated by verdant, gardened medians, this is officially recognised as the widest street on the planet. For the uninitiated pedestrian, crossing this colossal artery is a test of patience and timing, often requiring multiple traffic light cycles and a brisk pace. Stretching for approximately 1 kilometre, its sheer breadth is staggering, measuring an incredible 110 meters across. This extraordinary width isn't a mere aesthetic choice; it's a fundamental aspect of its design, deeply rooted in the city's grid-like urban fabric.

Why is Buenos Aires Avenue so wide?
The avenue's unusual width is because it spans an entire city block, the distance between two streets in the checkerboard pattern used in Buenos Aires. The avenue runs to the west of the Río de la Plata waterfront, from the Retiro district in the north to Constitución station in the south.
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The Genesis of Grandeur: Why So Wide?

The answer to Avenida 9 de Julio's prodigious width lies in its very conception. The avenue was designed to encompass an entire city block. Buenos Aires, like many South American cities, follows a checkerboard street pattern. Instead of carving a path through existing urban development, Avenida 9 de Julio was conceived to occupy the space of two such blocks, effectively creating a vast, open corridor. This strategic decision allowed for an unprecedented scale of urban mobility and monumental presence. The avenue gracefully sweeps along the western edge of the Río de la Plata waterfront, connecting the bustling Retiro district in the north to the vital Constitución station in the south. Its immense scale is further emphasised by the presence of up to seven lanes of traffic in each direction, complemented by two-lane parallel streets on either side, creating a multi-layered transportation network.

A Boulevard of Landmarks

Avenida 9 de Julio is more than just a thoroughfare; it's a ribbon of iconic Buenos Aires landmarks. As you traverse its impressive expanse, you'll encounter some of the city's most significant cultural and historical touchstones. Dominating the central median is the iconic Obelisco, a towering monument that has become synonymous with Buenos Aires. Further along, the grandeur continues with the former French Embassy, a testament to elegant architecture, and the poignant statue of Don Quixote, a beloved literary figure. The world-renowned Teatro Colón, a masterpiece of operatic architecture, also graces its vicinity. Remarkably, the avenue is not entirely devoid of buildings situated upon it. The former Ministry of Communications building stands as a singular exception, occupying a prime spot on the avenue itself at its intersection with Moreno Street. This unique placement underscores the avenue's role as a central, all-encompassing urban feature.

A Tumultuous Birth: Overcoming Obstacles

The creation of Avenida 9 de Julio was far from a straightforward endeavour. Its origins trace back to 1888 when it was initially planned under the name Ayohuma. However, the path to its realisation was fraught with significant opposition. Landlords and residents whose properties would be affected by the massive land acquisition voiced strong objections, leading to considerable delays. The project did not commence in earnest until 1935. Even influential foreign entities, such as the French government, resisted the demolition of their embassy building. Local preservationists also rallied against the demolition, recognising the embassy as an architectural marvel. Despite these hurdles, the initial phase of the avenue was inaugurated on 9 July 1937, a date that would lend its name to the grand avenue. The main stretch was eventually completed in the 1960s, with further southern connections finalised after 1980, coinciding with the completion of the downtown tollway system. The construction of these crucial intersections necessitated extensive and disruptive condemnations in the Constitución area, highlighting the immense scale of the undertaking.

Comparative Street Widths

To truly appreciate the scale of Avenida 9 de Julio, it's useful to compare it with other notable wide avenues around the world:

Avenue NameCityCountryApproximate Width
Avenida 9 de JulioBuenos AiresArgentina110 metres
Corso Vittorio Emanuele IIRomeItaly~50 metres
Pennsylvania AvenueWashington D.C.USA~50 metres (at its widest)
Unter den LindenBerlinGermany~60 metres
Boulevard HaussmannParisFrance~40 metres

As the table illustrates, Avenida 9 de Julio stands in a league of its own, more than doubling the width of many other famously broad avenues.

Frequently Asked Questions

Q1: Is Avenida 9 de Julio the widest street in the world?
Yes, Avenida 9 de Julio in Buenos Aires is widely recognised as the widest street in the world, measuring approximately 110 metres across.

Q2: Why is it called 9 de Julio?
It is named in honour of Argentina's Independence Day, which falls on July 9th, 1816.

Q3: What are the main landmarks along Avenida 9 de Julio?
Key landmarks include the Obelisco, the former French Embassy, the statue of Don Quixote, and the Teatro Colón.

Q4: Was the construction of the avenue controversial?
Yes, its construction faced significant opposition from landlords, residents, and even foreign governments due to land acquisition and demolition requirements.

Q5: How long is Avenida 9 de Julio?
The avenue is approximately 1 kilometre long.

In conclusion, Avenida 9 de Julio is a colossal urban feature, a testament to ambitious urban planning and a vital artery of Buenos Aires. Its extraordinary width, born from a unique approach to city-block integration, has resulted in a boulevard that is not only a functional transport corridor but also a stage for some of the city's most cherished landmarks. The journey from its initial conception to its eventual completion was a long and challenging one, marked by significant civic and architectural considerations. Today, it remains a powerful symbol of Buenos Aires' grandeur and its enduring spirit.

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