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Fauna · Cuiabá, Mato Grosso, Brazil

Green Anaconda Hunt — Pantanal Brazil

The green anaconda (Eunectes murinus) hunting in the Pantanal's Cuiabá River system — the world's heaviest snake (up to 9 metres and 250 kg), observable on the river banks during the dry season when retreating waters concentrate prey in accessible pools and the anaconda's daily sun-basking provides encounters at 5-metre range from the slow-moving river boat. The anaconda's combination of its extraordinary size (visible from 200 metres on the river bank, the body's diameter comparable to a human thigh), the hunting ambush posture (the head submerged at the water's edge, the body curved in a coil, waiting for caiman or capybara), and the river guide's knowledge of the regular basking sites creates one of South America's most reliably encountered large reptile observations. The Pantanal's anaconda density (the highest in the species' range) and the river system's accessibility from Porto Jofre and Cuiabá makes the northern Pantanal the world's finest accessible anaconda observation area.

When
Jun — Oct
Best viewing
A boat-based encounter with wild green anacondas basking and hunting along the Cuiabá River banks, with knowledgeable guides navigating to regular sighting spots at close range. Best experienced on dry-season mornings when prey concentration brings anacondas reliably to the water's edge.
Category
Fauna
Status
Returns Jun 2026

About this spectacle

From a slow-moving river boat on the Cuiabá River, visitors scan the grassy banks for the unmistakable form of a green anaconda — a body as thick as a human thigh, stretching up to 9 metres, visible from 200 metres away. During the dry season, retreating waters concentrate prey in shallow pools, drawing anacondas to predictable basking and ambush sites. At around 5-metre range from the boat, the encounter is intimate: the snake lies motionless at the water's edge, head submerged, body coiled in readiness for a passing caiman or capybara. Morning light warms the reptile into stillness, giving photographers extended windows. River guides know the regular basking sites by heart, transforming what could be a frustrating search into a reliable, high-probability sighting. The northern Pantanal holds the densest anaconda population in the species' range, and the flat, navigable river system makes this the world's most accessible location to observe the planet's heaviest snake in its natural hunting posture.

When to go

Jun — Oct

Getting there

Nearest airport: CGB. Nearest city: Cuiabá.

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