The fight for our planet is not a holiday, support the indigenous!
This was a decision taken at an important assembly of the inhabitants," said Juvencio Pereira, an indigenous guard, who stands watch at the guards' cabin.
"What we earn here is very little. Tourists come here, they buy a few things, a few artisanal goods, and they go. It is the travel agencies that make the good money."
The Ticuna people are one of the most endangered communities on Earth, with the United Nations having counted their remaining numbers at only around 30,000.
And they are fearful of seeing their culture eroded by prying visitors.
"We had lots of problems. People came, left their rubbish behind, garbage bags, plastic bottles," explained resident Grimaldo Ramos.
"Tourists come and shove a camera in our faces," he said. "Imagine if you were sitting in your home and strangers came in and started taking photos of you. You wouldn?t like it.
"Now the tourists can't just come as they please. They need the permission of the assembly."