San Martín Island: Iguazú's Island in the Falls

San Martín Island sits in the middle of the Iguazú River canyon, and the only way to reach it is a free pontoon boat from the bottom of the Lower Circuit — roughly a three-minute crossing. From its rocky shore you get a straight-on look at Salto San Martín and, on a clear day, both the Argentine and Brazilian cascades in a single sweep of the eye. Access, however, is decided daily at 10:30am based on river flow, and the island stays closed more often than it opens during the wet season.

The island measures about 350 metres across at its widest point and holds a short trail (under 1 km, though it climbs) to a handful of viewpoints. Most visitors who make it across spend 45 to 90 minutes there. What follows is what the crossing actually involves, when the odds of getting on are best, and how to fold the island into a day that also covers the Devil's Throat and the Upper Circuit.

Getting to San Martín Island

Where the Boat Leaves From

The launch departs from the far end of the Lower Circuit (Circuito Inferior), below the Salto Bossetti area. You do not need a separate reservation for the boat — it is included with the park entrance ticket. Boats run roughly every 15 to 20 minutes while the island is open, and the last departure to the island is at 3:15pm. If you are still on the island at 4pm you will be politely but firmly collected.

Reaching the Park from Puerto Iguazú

The park entrance is about 20 km southeast of Puerto Iguazú town. Local buses leave the bus terminal every 20 minutes from around 7:20am, take roughly 40 minutes, and drop you at the visitor centre. A taxi one way costs somewhere in the range of 300 ARS (prices move fast with inflation — confirm with your driver before getting in). Once inside, a small open-air tourist train connects the visitor centre, the Upper and Lower Circuit trailheads, and the Devil's Throat station. The Lower Circuit stop is where you want to get off.

The Boat Option from Puerto Macuco

A separate adventure route runs from Puerto Macuco: an 8 km drive down the Yacaratiá Trail in an all-terrain vehicle, then 6 km by semi-rigid boat up the Lower Iguazú, including 2 km of rapids. Some of these boats land on San Martín Island as part of the run. This is a paid excursion booked through operators in Puerto Iguazú, and it is the wettest, loudest way to arrive. Worth knowing: the boat ride is often the highlight for people who find the walkways too tame.

What You Actually See and Do

The Viewpoints

The trail from the island's landing rises through dense subtropical forest — expect real steps and exposed roots, not a stroll. Two viewpoints matter. The first faces Salto San Martín directly, close enough that the spray reaches you on a windy day; this is the closest legal approach to that particular fall from anywhere on the Argentine side. The second, higher up, gives you the panorama: the river's main channel heading north toward the Devil's Throat, plus the Brazilian cascades across the water. No mainland trail offers that simultaneous view. That single fact is the reason to bother with the crossing.

The Sheltered Beach

On the lee side of the island there is a small beach where swimming and paddling are possible. Keep close to shore. The Iguazú's current is deceptive and the water level can shift through the day. Locals treat this spot as a picnic ground rather than a swimming destination — bring lunch, claim a rock, and watch the mist roll off the falls.

Wildlife

Plush-crested jays will investigate your snacks with little shame. Coatis patrol the trail edges, and you may hear toucans without ever seeing one. The island's isolation means the undergrowth is thicker and the birdlife less habituated than along the main walkways — a small consolation if the ferry line was long.

Timing, Tides and Practical Realities

The 10:30am Verdict

Park staff assess river conditions each morning at 10:30am and post the decision at information points and the Lower Circuit embarkation area. In the dry season (roughly May to October) the island is typically open most days. In the rainy season (November to March), closures are frequent and can last several days. If the island is your priority, plan it early in your trip and keep a spare morning. I would not build a one-day visit around it.

How Long to Allow

Budget 45 to 90 minutes on the island itself, plus queue time. The crossing queues build sharply between 11am and 1pm. Arriving at the Lower Circuit right after the 10:30am announcement is the single best trick — most tour groups are still at the Devil's Throat at that hour.

Who Should Skip It

Anyone with knee or balance problems should think twice. The trail is short but genuinely steep and often slick. The same goes for families with very young children — the beach is fine, the upper trail is not. And if you have only one day in the park, the Devil's Throat and Upper Circuit deliver more for the time spent.

Frequently Asked Questions

Do I need to book San Martín Island in advance?

No. The pontoon crossing is free and included with your Iguazú National Park entrance ticket — no separate reservation exists. The only thing that decides your access is the daily 10:30am river-level assessment.

When is San Martín Island most likely to be open?

May through October, the dry season, when the Iguazú runs lower. During November to March, high water closes the island frequently and sometimes for consecutive days. Check at any park information point on the morning of your visit.

How long does the island visit take?

Plan 45 to 90 minutes on the island, plus up to 20 minutes of queueing for the boat. The last boat to the island leaves at 3:15pm, so an early-afternoon arrival is the practical deadline.

Can you swim at San Martín Island?

Yes, in the sheltered water on the island's lee side — but stay close to the beach. The river's current and shifting levels make any venture away from shore unwise, and there are no lifeguards.

Is San Martín Island worth it if the falls are already spectacular from the walkways?

Only the island gives you a frontal view of Salto San Martín and a combined Argentine-Brazilian panorama in one frame. If that specific perspective matters to you, go. If you are short on time, the Devil's Throat delivers a bigger emotional hit for the effort.