Kagoshima Bay
About 24,000 years ago, Aira Caldera, corresponding to Kagoshima Bay and larger areas, erupted a number of times, with the volcanic ash reaching as far as Hokkaido as well as forming through pyroclastic flows. As of 2005, about 40 archaeological sites of the Lower Paleolithic era had been found in Prefecture. In , , a camp site of the Lower Paleolithic era 31,000 years ago, sharpened stones and burned soil were found.