Overview
San Martín Island sits in the middle of the Iguazu River gorge directly below some of the most powerful cascades in the Iguazu Falls system, yet most visitors never set foot on it. A free boat service runs from the base of the Lower Circuit to the island's dock, depositing you on a wild, jungle-covered landmass where trails climb through dense subtropical vegetation to viewpoints that look straight up at thundering waterfalls from a perspective you simply cannot get from the catwalks.
The Ventana (Window) viewpoint, reached by a steep staircase through the forest, frames a curtain of cascading water so close you can feel the wind it generates on your face. The island also offers something rare at Iguazú: solitude. While the main catwalks teem with visitors during peak hours, San Martín Island receives a fraction of the foot traffic. Small sandy beaches tucked into sheltered coves provide swimming spots in the calm waters downstream of the falls (when water levels permit), and the jungle canopy is alive with butterflies, toucans, and the occasional monitor lizard basking on rocks. A guide familiar with the island's trails can lead you to viewpoints that most visitors — even those who make it to the island — never find. The boat service operates on demand and is included in the park entry fee, making it one of the best free additions to any Iguazu Falls visit. For the full picture of the region, see Hito Tres Fronteras for the triple border viewpoint.
Trails
Ventana viewpoint: A steep staircase through the jungle leads to a natural window in the vegetation that frames a wall of cascading water — the most intimate waterfall viewpoint in the entire park. Secluded swimming coves: Small sandy beaches on the island's sheltered side offer calm-water swimming when river levels are right — a surreal experience with the roar of waterfalls as your soundtrack. Jungle immersion: Dense Atlantic Forest covers the island, and the trails feel properly wild — a sharp contrast to the manicured catwalks of the main circuits. Unique angle on Salto San Martín: The cascade that shares the island's name is best viewed from the island itself, where you look directly into the curtain of water from below.
Wildlife
The island's jungle microclimate attracts massive concentrations of butterflies — hundreds of species flutter along the trails, landing on visitors attracted by bright colors and sweat. Toco toucans and smaller aracari species perch in the canopy overhead, their calls cutting through the waterfall roar. Monitor lizards bask on sun-warmed rocks near the landing dock, and coatís occasionally appear along the trails though they are less bold here than on the main catwalks. The surrounding water channels harbor caimans that can sometimes be spotted from the boat on the short crossing. Because the island receives far fewer visitors than the main circuits, wildlife is noticeably less habituated and more naturally behaved — a guide with sharp eyes will spot species hiding in the understory that solo visitors walk right past.
When to Visit
Boat service: 8:30 AM - 4:30 PM (departures on demand from the Lower Circuit dock). Closed: When river levels are dangerously high — typically during peak rainy season floods. Best: Visit after walking the Lower Circuit in the morning, when you've already oriented yourself to the falls and are ready for a different perspective. Duration: 1-2 hours on the island is ideal.
Admission and Costs
Boat to island: Free — included with park entry ticket. Park entry (foreigners): AR$20,000-30,000 ($20-30). Guided island exploration: Included in full-day park tours (AR$50,000-90,000 / $50-90).
Tips for Visitors
Don't skip it: Most visitors run out of time or energy before reaching the island — make it a priority rather than an afterthought. It's free and offers the park's most unique perspective. Sturdy shoes required: The island trails are steep, muddy, and uneven. Flip-flops will result in slipping; bring proper walking shoes or hiking sandals with grip. Bring water and snacks: There are no vendors on the island. Carry enough water for 1-2 hours, especially in the subtropical heat. Check boat status early: If the river is running high, the boat service may be suspended. Ask at the park entrance about island access before planning your day around it. Combine wisely: Walk the Lower Circuit first (ending at the boat dock), take the boat to the island, explore for an hour, return, then head to the Devil's Throat via the Ecological Train for a grand finale.