Mount Unzen
is a city located on the north-eastern tip of the Shimabara Peninsula, facing Ariake Bay in the east and Mount Unzen (including Fugendake) in the west, in Nagasaki Prefecture, Kyushu, Japan. As of October 1, 2016, the city has an estimated population of 44,936 and a population density of 540 per km². The total area is 82.77 km².