Amazon River Travel Guide: Discover the World's Greatest River

Numbers do the talking here, and they are worth pausing over. The Amazon carries an estimated 28 billion gallons of water into the Atlantic every minute, discharging roughly a fifth of all the freshwater that enters the world's oceans. Fed by more than a thousand tributaries, it forms the largest drainage system on the planet, gathering rainfall across an area larger than most continents before releasing it in a single, unbroken current. Longer conversations about rivers tend to circle back to one debate: is the Amazon River actually longer than the Nile? Measurements vary depending on where a river's source is defined, but the most cited figure puts the Amazon at more than 6,400 kilometres, a length that keeps the question open rather than settled. What is not in question is volume. On that measure, nothing else comes close.

Step back from the water and the scale becomes ecological rather than hydrological. The Amazon rainforest ecosystem spans 9 countries and roughly 2.3 million square miles, close to 40% of South America, and is often credited with generating close to a fifth of the planet's oxygen. It shelters nearly 20% of all land-based species on Earth, a density that becomes almost abstract at ground level. A single hectare of forest can hold more than 300 different tree species, more than the whole of North America combined. Guests planning ahead can discover South America and the Amazon to see how this single ecosystem shapes an entire season of travel, from the river itself down through Patagonia. None of this, though, quite prepares a first-time visitor for what moves through the canopy and along the banks.

So, what animals are in the rainforest that lines the Amazon? Pink river dolphins, known locally as boto, surface without warning in the main channel, one of only three freshwater dolphin species left anywhere in the world. Giant otters travel in noisy family groups along the tributaries; jaguars move along the forest edge at dawn and dusk; and three-toed sloths hold so still in the canopy that moss gathers across their fur. Black caimans drift at the waterline after dark, while scarlet, blue and yellow macaws gather at clay licks in numbers that silence most conversation on deck. Piranhas, meanwhile, carry a reputation the fish rarely earns; attacks on humans are rare, and almost always tied to specific conditions such as low water or distressed prey, not the frenzy of popular imagination. Local guides know where to look and when to hold back, and that quiet discipline, watching without disturbing, is what good wildlife encounters here depend on.

Timing changes the river as much as the river changes with the seasons. During the wet season, roughly December to May, water levels rise high enough to float a canoe beneath the canopy itself, opening up the surreal yet scenic possibility of sailing through the treetops. The dry season, roughly June to November, drops the water level and exposes riverbanks and beaches, favouring longer hikes and clearer sightings of caimans and wading birds along the shore. Neither season outperforms the other so much as offers a different river. For most travellers considering when to sail the Amazon, the honest answer lies in the kind of encounter they would rather have: paddling beneath the canopy or walking beside it.

Sailing this deep into the river is rare among ships of any size. Explora Journeys' own approach sets itself apart here. EXPLORA I ventures into the Amazon during its Winter 2027 to 2028 season, calling at Parintins, Alter do Chão, Santarém and Boca da Valeria, with an overnight stay in Manaus that allows guests to see the city, and the Meeting of the Waters beyond it, without rushing between the two. Discover EXPLORA I to see how Explora Journeys’s ships are built for exactly this kind of Amazon River exploration; her scale is precisely what allows such a Journey most ships could never attempt. The river Journey also connects naturally to the wider South America and Amazon Journeys programme aboard EXPLORA I. Continuing down the continent's coast through Uruguay, Argentina, the Falkland Islands, Chile, and as far as Patagonia and Cape Horn, this season is built around the same instinct: to sail closer to a place than any itinerary usually allows.

Some rivers can be visited. The Amazon, sailed properly, can only be entered.