Final answer:
The Pygmies of Central Africa represent a truly isolated group of indigenous people living a traditional hunter-gatherer lifestyle in geographical isolation.
Step-by-step explanation:
One truly isolated group of people in the world are the Pygmies living in the jungles of Central Africa. These indigenous populations are representative of small groups of hunters and gatherers that have lived in geographical isolation for extended periods. Despite modern advances, these communities maintain their traditional lifestyle, often in voluntary or involuntary isolation from mainstream societies. The Pygmies, with their unique mode of living and cultural characteristics, face tensions with the Bantu farmers in their vicinity, reflecting a complex interplay between different social groups and lifestyles.