Jungle Marathon is a 260km / 7 stages ultra marathon in Santarém, Brazil. Distance: 260km. Elevation: 800m D+. Difficulty: brutal (Challenge Rating 55/100). DNF rate: 30%. Time limit: 168h. Surface: trail. Established 2003.
Jungle Marathon
Santarém, Pará, Brazil
"260km through the Amazon. Waist-deep swamps, river crossings, and the most hostile jungle on Earth."
The world's toughest multi-stage race — 260km self-supported through the Amazon rainforest with river crossings, swamps, and jungle camps.
The Course
A self-supported multi-stage race through the Amazon rainforest. Runners wade through waist-deep swamps, cross rivers, and hack through dense jungle. The course changes every year as the jungle reclaims trails. Extreme humidity, venomous wildlife, and river crossings define this race.
flat
point-to-point
Runner Experience
Self-supported race — runners carry all supplies. Checkpoints for timing and safety only.
A legendary finish line atmosphere. Jungle Marathon is a bucket-list race with celebrations that match its reputation.
Race Day Weather
30°C
24° – 36°
95%
70%
Amazon wet season — extreme heat and humidity. Constant sweating. Torrential afternoon rain is normal.
Stats & Records
2003
40
7:00:00:00
Entry
EUR 3,500
January
months
Lore & Trivia
The Brazilian Jungle Ultra pushes runners through the Atlantic Forest — one of the most biodiverse ecosystems on earth, with more species per hectare than the Amazon. The multi-stage course crosses dense tropical forest where the canopy blocks most sunlight, rivers run chocolate-brown with tannins, and the humidity is so thick that nothing ever dries. Trail running in Brazil's Atlantic Forest means mud that swallows shoes, river crossings that are waist-deep, and an orchestra of tropical birds, frogs, and howler monkeys as your soundtrack. The race was created to bring attention to the Atlantic Forest's critical conservation status — only 12% of the original forest remains.
- ▸ Multi-stage through Brazil's Atlantic Forest.
- ▸ One of the most biodiverse ecosystems on earth.
- ▸ Only 12% of the original Atlantic Forest remains.
- ▸ Humidity approaches 100% — nothing ever dries.
- ▸ River crossings are frequent and deep.
- ▸ Howler monkeys, toucans, and tree frogs provide the soundtrack.
- ▸ Created to raise awareness of Atlantic Forest conservation.
In the jungle, you don't run on the trail. You negotiate with it.
Compare with another race
Similar Races
13 JUN 2026
Rio do Rastro Ultra
Urubici, Brazil
16 SEP 2026
Ultra Selvagem
Chapada dos Veadeiros, Brazil
13 MAY 2026
Atacama Crossing (4 Deserts)
San Pedro de Atacama, Chile
12 AUG 2026
El Cruce Columbia
Villa La Angostura, Argentina
Frequently Asked Questions
How long is Jungle Marathon? +
Jungle Marathon is a 260km / 7 stages (260km) ultra marathon with 800m of elevation gain. The course is point-to-point on trail terrain.
How hard is Jungle Marathon? +
Jungle Marathon is rated brutal with a Challenge Rating of 55/100 (Challenging). The DNF rate is 30%. Runners have 168 hours to finish.
What is the weather like at Jungle Marathon? +
Average temperature is 30°C (range 24°C to 36°C) with 95% humidity and a 70% chance of rain. Amazon wet season — extreme heat and humidity. Constant sweating. Torrential afternoon rain is normal.
Are crew and pacers allowed at Jungle Marathon? +
No crew access is permitted. Pacers are not allowed. Mandatory gear is required.
What is the average finish time for Jungle Marathon? +
The average finish time is 7:00:00:00. About 40 runners finish each year. The DNF rate is 30%.
Are you the organizer? Claim this race
Stay in the loop
New races, course records, and stories from the trail — monthly