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Vietnam
Brazil
Area Comparison
Hanoi is 2.8x larger than Rio de Janeiro
Population Comparison
Hanoi has 1.2x more people than Rio de Janeiro
Hanoi is significantly larger, covering 2.8 times the area of Rio de Janeiro. Hanoi spans 3,359 km² (1,297 mi²) while Rio de Janeiro covers 1,221 km² (471 mi²) — a difference of 2,138 km². You could fit Rio de Janeiro inside Hanoi approximately 2 times.
To put Hanoi's size in perspective, its area of 3,359 km² is about 1.2x smaller than Rhode Island. Meanwhile, Rio de Janeiro at 1,221 km² is about 1.3x smaller than London.
Vietnam's capital with over a thousand years of history. Known as "The City of the Ascending Dragon", Hanoi covers 3,359 km² with a population of 8.1 million. The city was established in 1010. Hanoi is known for Hoàn Kiếm Lake, Old Quarter (36 Streets), Ho Chi Minh Mausoleum, among other attractions. The city's main transit system is the Hanoi Metro.
Hanoi's Old Quarter has been a trading hub for nearly 1,000 years, with each street historically dedicated to a specific trade
Brazil's iconic coastal city known for Carnival. Also known as "The Marvelous City", Rio de Janeiro has an area of 1,221 km² and is home to 6.8 million people. Its history stretches back to 1565. Visitors come for Christ the Redeemer, Copacabana Beach, Carnival, and much more. Getting around is easy with the MetrôRio.
Rio's Christ the Redeemer statue is struck by lightning an average of 6 times per year
Looking beyond city limits, the Rio de Janeiro metropolitan area covers 6,744 km², which is 2.0x larger than greater Hanoi at 3,359 km². The Rio de Janeiro metro area is also more populous, with 13.5 million people compared to 8.1 million.
Hanoi has a population density of 2,397 people per km² — a moderately dense city. Rio de Janeiro, with 5,528 people per km², is a densely populated city. Rio de Janeiro is noticeably denser, packing 2.3 times more people per square kilometer.
This comparison spans continents — Hanoi in Asia versus Rio de Janeiro in South America. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Hanoi has a humid subtropical climate while Rio de Janeiro experiences tropical savanna conditions. When it's noon in Hanoi, it's 2:00 AM in Rio de Janeiro — a 10-hour time difference.
Size Ratio
Rio de Janeiro fits inside Hanoi ~2 times
Density Gap
Rio de Janeiro is 2.3x more densely populated
Time Difference
10 hours apart
History
Hanoi is ~555 years older
The straight-line distance from Hanoi to Rio de Janeiro is 16,818 km (10,450 miles), with an estimated flight time of ~20h 17m. See full distance details, including timezone difference and city facts.
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