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Augmentation Augmentation Southern California presents a varied and somewhat unique region of the state. Beginning in the north, tribes found in this area are the Chumash, Alliklik, Kitanemuk, Serrano, Gabrielino Luiseno Cahuilla, and the Kumeyaay. The landmass and climate varied considerably from the windswept offshore Channel Islands that were principally inhabited by Chumash speaking peoples..