Achasta (also, Achiesta) is a former Ohlone settlement in Monterey County, California, United States. It was located at the site of modern-day Monterey.

Achasta was historically a dwelling of the Rumsen people. Alternate historical spellings include Achastas, Achastli, Achastlian, Achastlien, Achastlier, Achastlies.

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