Minamishimabara-shi

In the latest Population Census the population is about 42,000 (42,330 in 2020). Because this city was established in 2006 by binding eight towns anew into one, its population statistics as a city cover the period from 2010, after the merger, on — the period the Census reflects. From the 50,363 of 2010, to the 46,535 of 2015, to the 42,330 of 2020, it has greatly decreased.

Looking inside, the figure of a city at the southern tip of the peninsula holding a castle site and a port appears. The share aged 65 and over rose from 36.2% in 2015 to 40.4% in 2020, passing four in ten. The household-with-children share is 18.9% (2020), and the crude birth rate is 5.6 per thousand in 2020. The Childcare Waitlist was zero in both 2024 and 2025. The Fiscal Capacity Index was 0.25 in fiscal 2023 — a level able to cover only a little over two-tenths of expenditure with its own tax revenue, with a large degree of reliance on the local allocation tax. At the southern tip of the peninsula holding the site of a castle where many people barricaded themselves nearly four hundred years ago, the population has greatly fallen after the merger and the aging has passed four in ten. Why it takes this form cannot be read without going back to the past of the sea castle, the port and somen.

What supports Minamishimabara’s past is the castle site on a hill by the sea, the battle of the people who shut themselves in there, the port into which ships from across the sea entered, and the merger of eight towns. The oldest layer is the seaside castle site. On a hill overlooking the sea of this land is the site of a castle of nearly four hundred years ago. Many people suffering under heavy burdens and the ban on their faith barricaded themselves here and fought the shogunate’s great army for a long time, and after the siege the castle fell. The castle site on a hill overlooking the sea is this town’s oldest foundation.

In this land of the castle site remained the traces of people who kept their faith. In time there were people who, through an age when it could not be shown, secretly kept and handed down their faith, and together with their traces this castle site was counted as a World Heritage. By the sea there is also a port said to be one into which, in old times, ships from across the sea entered earlier than at other ports. The handcraft of somen — drying thin noodles — also took root in the land behind it. The newest layer is the path to becoming a city. In 2006 the eight towns in the south of the peninsula were bound anew into one, and the present city was established. The seaside castle site, the rebellion’s siege, the port into which ships from across the sea entered, and the merger of eight towns — the land that piled these four layers is the present Minamishimabara.

What characterizes Minamishimabara is that, while it holds the past of the southern tip of the peninsula holding the site of a rebellion’s siege, it is greatly losing population after the merger. From the 50,363 of 2010, seen in the city area after the merger, to the 42,330 of 2020, some eight thousand were lost over ten years. The fall is large. Even in this land where a castle site of nearly four hundred years ago sleeps and which is counted as a World Heritage, because it lies at the southern tip of the peninsula, far from the larger cities, one can read that some of the younger generation moved out of the town in search of work and study, and the town’s age as a whole greatly rose. That the share aged 65 and over passed four in ten at 40.4% in 2020 is an expression of that.

On the other hand, the Childcare Waitlist was zero in both 2024 and 2025, and the household-with-children share, at 18.9% in 2020, and the crude birth rate, 5.6 per thousand in 2020, are both low. The Fiscal Capacity Index of 0.25 is a level able to cover only a little over two-tenths of expenditure with its own tax revenue, showing the large degree of reliance on the local allocation tax seen in common across lands at a peninsula’s southern tip. The population greatly fell after the merger, the aging passed four in ten, and the body of the finances is not thick on tax revenue alone. What overlap of numbers the southern tip of the peninsula, holding the stage of history, has now settled into — that comes into view only when population, age and finances are laid out on a single sheet.

The functions Minamishimabara holds are not one. It holds the face of a siege castle site, with a castle site of nearly four hundred years ago on a hill overlooking the sea, where many people suffering under heavy burdens and the ban barricaded themselves and fought a great army. It also holds the face of a World Heritage castle site, leaving that castle site as a World Heritage together with the traces of people who, through an age when it could not be shown, secretly kept their faith. And it holds the face of a land of a sea port and somen, with a port said to be one into which ships from across the sea entered early in old times, drying thin noodles in the land behind. The hill overlooking the sea, and the landform of the southern tip of a peninsula open to the sea, brought the siege castle site, the sea port and somen to this land.

A castle site on a hill overlooking the sea held the memory of a siege and a port by the sea — that is the town Minamishimabara is. From the seaside castle site, to the rebellion’s siege, the port into which ships from across the sea entered, and the merger of eight towns, what set the skeleton was the geography of "the southern tip of a peninsula holding a hill overlooking the sea." The condition of being far from the larger cities at the southern tip of the peninsula — which now loses population — made possible, nearly four hundred years ago, a siege against a great army. The same "distance" gives rise at once to the stage of a siege and to the numbers of depopulation.