Pacaya-Samiria National Reserve

Pacaya-Samiria is the wildlife heart of the Peruvian Amazon. The reserve covers roughly two million hectares between the Marañón and Ucayali rivers, which join to form the Amazon, and much of it is seasonally flooded forest, a mosaic of black-water lagoons, channels and palm swamps that rise and fall with the rains. It is one of the largest protected areas in the country and one of the best places in Peru to see river wildlife without the long overland journeys needed elsewhere in the basin. From Iquitos the usual route is a drive south to the river port of Nauta, followed by boat travel into the reserve, which is why trips here are sold as multi-day expeditions rather than quick excursions. This three-day trip is built for travelers who want a proper taste of the reserve without committing to a week.

What you can expect to see depends on the water level, but the cast is impressive: pink and grey river dolphins, several species of monkey including squirrel and howler monkeys, sloths, caimans, iguanas, and a long list of birds such as macaws, herons, kingfishers and hoatzins. Giant water lilies, the victoria regia, grow in quiet lagoons, and the reserve is known for large fish such as the arapaima, one of the biggest freshwater fish in the world.

Days are usually organized around early and late boat or canoe outings, when animals are most active, with a walk or a swim and a rest in the heat of the afternoon. Nights bring a spotlight outing for caimans and frogs and a sky with very little light pollution.

Itineraries and standards vary between operators, so read the trip description carefully when you book. Look at where you sleep, whether in a lodge, a floating or stilted house, or a camp, how big the group is, what the guide ratio is, and whether park entry, meals, water and transfers are included. The reserve is managed by the national protected-areas authority, and entry fees and visitor rules apply to everyone, so a reputable operator will explain what is covered.

Because this is a long trip into a remote area, it is worth choosing a company that carries a first-aid kit and a radio or phone plan, and one that makes clear what happens if weather or river levels change the plan.

Practical preparation matters more here than on a city break. Bring lightweight long-sleeved clothing, a rain jacket, insect repellent, a hat, sun protection, binoculars if you have them, a flashlight or headlamp, and a dry bag for electronics. Speak to a travel clinic well before departure about vaccinations and malaria advice for Loreto, because health recommendations change. For a longer or more comfortable experience, other options from Iquitos include camping trips in the same reserve and lodge stays on the Amazon and its tributaries closer to the city.

Think about how this trip fits the rest of your itinerary. Iquitos has no road connection to the rest of Peru, so flights and river schedules are the only ways in or out, and a delayed flight can cost you a night in the reserve. Arrive at least a day early, keep your return flight flexible if you can, and tell your operator about any food allergies, medication needs or mobility limits before you leave.

Travel insurance that covers medical evacuation is sensible for any expedition into a remote area, and a small supply of cash in soles helps for tips to guides, boatmen and cooks, who depend on them.