Iguazu Falls tours: Cataratas del Iguazú and Cataratas do Iguaçu compared

The river rises near Curitiba and reaches the border after crossing the Paraná plateau, where it runs over the lava flows of the Serra Geral basalt. The edge of that rock is what you see: a lip of almost 2.7 km, broken by islands into 275 drops that average 75 m, according to the IUGS Geoheritage page. Wikipedia puts the highest at 82 m and says the count moves with the flow, from 150 to 300, so any single number is a snapshot. The Devil's Throat (Garganta del Diablo, Garganta do Diabo) is the U-shaped gorge at the upstream end, on the border, where the largest share of the river falls.

Count the drops on a dry day and again after a flood: the falls are a different place.

The border runs down the river, and each side has its own park, its own ticket, its own hours and its own decision on when to close. Argentina created its park in 1934 and Brazil followed in 1939. UNESCO inscribed them separately, in 1984 and 1986. A flood can close one walkway and leave the other open, because each park decides for itself.

Both parks close the walkway to the Devil's Throat when the river rises, but we found a published rule only for the Brazilian side. Urbia Cataratas, the concessionaire that runs visits to the Brazilian park, states in a protocol page dated 13 October 2026 that the walkway closes preventively when the flow is above 8.5 million liters per second and rising, and that the railings come down when it is between 9 and 12 million and rising. Its reopening line cites 8.5 million again, plus a technical review and an engineer's authorization, so we do not read it as a reopening number. On the Argentine side we found no published threshold, and no page of the national parks agency that we read gives one. The park can also act ahead of a forecast: in 2026 it took its walkway down as a precaution before the water arrived, and press reports put the rebuild at 30 to 60 days after levels return to normal. The Brazilian walkway opened and closed several times in the same year, per press reports.

A closed walkway is a photograph of one day, not a rule.

A listing that says «open» or «closed» is therefore a statement about the day it was written.

For a tour the consequences are specific. The Argentine Upper and Lower Circuits and the Brazilian panoramic trail usually stay open when the Devil's Throat does not. The boat under the falls depends on the river too: one operator says a level too low or too high affects it, about twice a year. The Brazilian park posts dated notices on its home page, cataratasdoiguacu.com.br. The Argentine closure of 2026 was reported by regional press, and the national parks agency's page carried no notice on the page we could open, so read both. Ask your operator in writing what replaces the Devil's Throat if it is shut.

Roads add to those straight lines. Blog accounts put each park at 20 to 30 minutes from its own town, and the border between the two towns adds a wait that operators warn about and none of them can promise. The map also marks Ciudad del Este, in Paraguay, and the Itaipu dam; a few listings add a photo stop where the three borders meet. Bring your passport on any tour that crosses the border.

Travel guides put the high-flow months at December to March, with heat, humidity and school holidays in January and February, and the low-flow months from June to August, with clearer skies. No official source we read gives the months, and the record flow of 9 June 2014 came in the middle of the supposed low season. A flood can arrive in any month and a walkway can close for weeks, so no month is safe from a closure and none is certain to have one.

The typical 120 to 250 EUR hides the format: 19% of the 80 tours are multi-day, 41% private, 15% include a boat and 5% a flight. The four pages below split them by what you buy. Read the Brazilian side page for a shorter panoramic day, the Argentine side page for the day on the walkways, both sides for two parks in a day and multi-day packages for hotel and transfers.

Both sides costs a little more than one side, so the second park adds little to the bill if you have only one day. It also has the best rating, 4.91; 65% of its listings are private. The multi-day price, typically 120 to 250 EUR, is not comparable with the day trips: hotels and transfers are inside it, and the range runs from under 120 to more than 500 EUR. The ticket for each park is a separate line in most listings, so compare the Included lines before the prices.