Are Iguazu Falls bigger than Niagara?

In extent, yes. Around 275 falls spread across nearly 3 km of front, against a much shorter front at Niagara. Niagara's advantage is steady average volume; here the volume swings a lot with rainfall.

Are they a UNESCO World Heritage site?

Yes, in both countries, as separate inscriptions: Iguazú National Park (Argentina) was listed in 1984 and Iguaçu National Park (Brazil) in 1986.

How many people visit each year?

The Brazilian side received 2,058,539 visitors in 2025, the highest in the series we track since 2019, when it was 2,020,358.

Is it worth visiting both sides?

Yes, because they deliver different things: the Brazilian side gives the panorama of the whole set, and the Argentine side puts you inside the falls on walkways over the river. With one day only, choose by what you want to feel.

Why visit Iguazu Falls? What you only get here

Two world listings, two countries, and a river that never gives you the same landscape

Because they are a UNESCO World Heritage site in both countries, one of the Seven Natural Wonders, and around 275 waterfalls spread over nearly 3 km. And because the river changes: the flow we measure varied more than sixfold within weeks, so every visit is a different landscape.

Direct answer: Because they are a UNESCO World Heritage site in both countries, one of the Seven Natural Wonders, and around 275 waterfalls over nearly 3 km, with the Devil's Throat at roughly 80 m high. And because you never see the same landscape twice: the flow we measure on the Iguaçu river varied more than sixfold within a few weeks of 2026.

Recognition that comes twice

Few places in the world hold two UNESCO inscriptions for the same landscape, one on each side of a border. Here they do:

Iguazú National Park (Argentina) joined the World Heritage List in 1984. The park was created in 1934 and protects around 677 km² of subtropical forest.
Iguaçu National Park (Brazil) joined in 1986.

In 2011, the falls were voted one of the Seven Natural Wonders.

What you see: the landscape in numbers

Around 275 waterfalls spread over nearly 3 km of front. The largest, the Devil's Throat, stands roughly 80 m high and is where the whole river narrows into a single bend.

Around it, preserved Atlantic Forest: more than 2,000 vascular plant species and wildlife that includes jaguar, tapir, howler monkey, broad-snouted caiman and the toucan in everyone's photos.

The argument you can only make by measuring

No guide can promise "the same photo" here, and that is a virtue. We measure river flow straight from the National Water Agency gauge inside the park, and the number moves:

Moment (2026)	Flow	How much
Historical average	1,500 m³/s	reference
10 Sep, 14:00	3,868 m³/s	2.6× average
11 Sep, 20:00	8,936 m³/s	6.0× average

The river more than doubled in 26 hours. Visitors on Wednesday and on Thursday saw two different waterfalls. In flood, the roar and the spray take over; at low flow the rock architecture appears and you can count the separate drops. Both versions are worth it, and neither is the "wrong" one. Follow it at how the Falls are today.

Two sides, two experiences

This is not redundancy, it is complement:

Brazilian side: the trail gives you the panorama, the whole set in a single frame, ending on the walkway over the river facing the Throat.
Argentine side: circuits that put you inside the falls, on walkways above the water, with an ecological train and far more walking.

With a single day, choose by what you want to feel: the two sides compared.

How many go, and when

We track monthly visitor numbers on the Brazilian side back to 2019. What the series shows:

2025 was the busiest year: 2,058,539 people, above 2019 (2,020,358).
January and July are the peaks (142% and 137% of the median month).
May is the trough (72%), followed by June (78%).
And the detail that breaks the common assumption: February sits at 87%, in high summer. What fills the park is not the heat, it is school holidays.

In other words, you can catch the falls at peak water without peak crowds. The window is in best time of year to see the Falls.

Before you go

Brazilian side prices and exemptions: Iguazu Falls tickets.
Fares by nationality and the second-day discount: Argentine park entrance.
Today's status, including what is open: are the Falls open today?

Source: UNESCO (1984 and 1986 inscriptions), New7Wonders (2011), ICMBio/Urbia Cataratas for visitor numbers, and our own Iguaçu river measurement (ANA gauge, Hotel Cataratas).

Why visit Iguazu Falls?