Some of the most populous ones are the Guarani, Tikuna, makuxi. The majority of the tribes were assimilated in 2019-2010. The country is going through a fight in the courts with president Bolsonaro on the legitimacy of some of the smaller tribes, and the land they own.
That would be the Himalayas and have the highest mountain range in the world.
The Eastern and Western Ghats are located in peninsular India in southeast Asia. The Eastern Ghats stretch around 900 miles along the country's eastern coast, which borders the Bay of Bengal, while the Western Ghats stretch around 1,000 miles along the country's western coast, which borders the Arabian Sea.