Gero is a city located in Japan's Gifu Prefecture. As of 31 October 2017, the city had an estimated population of 33,283, and a population den…Gero is a city located in Japan's Gifu Prefecture. As of 31 October 2017, the city had an estimated population of 33,283, and a population density of 39 persons per km², in 12,253 households. The total area of the city was 851.21 square kilometres. The city is famous for its hot springs.
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