Indigenous leaders from across Brazil are preparing to march on the capital Brasilia this week.

They want the country’s Supreme Court to hear their voices, before a landmark ruling, which may put a stop to hundreds of demarcation processes and allow many decided cases to be reviewed.

The powerful farm lobby, as well as mining and logging companies, want to set 1988 as a cut-off date, for native tribes to claim their lands – arguing that, if they were not occupying them at the time, they lost their rights.

But native Brazilians say it’s unconstitutional.

The Amazon rainforest isn’t the only place where indigenous people are under attack from land grabbers and loggers.

The Guarani village Little River, close to the colonial city of Paraty and one of Rio de Janeiro’s most exclusive resorts, is under siege, with its leader receiving death threats.

The Guarani village Little River’s leader takes death threat seriously, after her brother was murdered, and after a series of attacks.

The conflict in Paraty is an example of what is going on in other parts of Brazil and its outcome will depend on a Supreme Court ruling, which will set a precedent to many other land demarcations in process.

The Supreme Court decision is expected on August 25.

Aljazeera/Agencies.