Shimonoseki-shi

In the 2020 Population Census the population is 255,051 — the port town at the westernmost tip of Honshu. In the five years from 268,517 in 2015, it fell by more than thirteen thousand. A decline of this width in five years is hard to call gentle.

The number of children moves the same way. Those under 15 fell by about three thousand, from 31,116 (2015) to 28,155 (2020). In the same five years the share aged 65 and over rose from 32.8% to 35.4%, already passing one in three. The three flows — total population falling, children falling, the elderly share rising — all proceed together in the same direction. The household-with-children share was 17.0% (2020). The Official Land Price for residential land is about 40,000 yen per m² (40,250 yen/m², 2026). The Fiscal Capacity Index is 0.54 (2023), below 1.0 — a structure that covers a little under half of standard expenditure with its own tax revenue and supplements the rest with the local allocation tax and the like. The Childcare Waitlist is 0 (2025). But what to note here is that a zero waitlist, while children fall by three thousand, contains the side of demand itself having thinned. Why it takes this shape cannot be read without going back over the history of a strait port town.

Shimonoseki’s skeleton is the strait itself that divides Honshu and Kyushu. The Kanmon Strait joins the Sea of Japan and the Seto Inland Sea and, while separating Honshu from Kyushu, also binds them; it has long been a stage of history as a key point of sea traffic. That the Battle of Dan-no-ura of 1185 was decided in this strait shows that here was, from of old, a knot of comings and goings and of conflict. In economic geography, it is an old, real instance of the type "a city stands at a node."

Its modern life as a town begins with the port. Once called Bakan, in 1889 it was founded as Akamagaseki City, one of the thirty-one cities that first put the municipal system into force in Japan, and in 1902 it was renamed the present Shimonoseki City. The port facing the strait prospered as a gateway to the continent and as a knot of routes linking the Sea of Japan and the Seto Inland Sea. Fisheries joined the port, and in 1966 Shimonoseki fishing port stood first in the nation in annual landings. That it is known as a gathering place for pufferfish, too, rests upon this history of the sea and the port.

But in the latter half of the twentieth century, the strait’s role is rewritten. The Kanmon Railway Tunnel, the world’s first undersea railway tunnel, opened in 1942 and 1944; the Kanmon Roadway Tunnel in 1958; and in 1973 the Kanmon Bridge, 1,068 meters long. Honshu and Kyushu became joined by land, by rail and by road. A strait that could only be crossed by boat changed into a strait that one passes through. The siting of facing across the sea bore a port town, and in time bore a traffic that did not pass by way of that port. Shimonoseki’s present is here, as the result of the same condition — a strait — holding a different meaning age by age.

What characterizes Shimonoseki is that, while the population falls by thirteen thousand in five years and children fall by three thousand, the Childcare Waitlist has reached 0. To read this simply as "childcare was made ample" is too quick. As the absolute number of children itself thins, the same childcare capacity catches up to demand more easily. It is the same structure as in regional cities seen where children thin — whether a zero waitlist is the result of having increased supply, or the result of demand having shrunk, has its meaning fixed only when read together with the movement of the number of children. In Shimonoseki’s case it is a zero amid a fall of three thousand in those under 15, and cannot be told apart from the side of demand contracting.

The elderly share passes one in three, and the household-with-children share stays at 17.0%. The Fiscal Capacity Index of 0.54 shows a structure that can cover only a little under half of standard expenditure with its own tax revenue and leans on the local allocation tax for the rest. This is not an evaluation, but the standard figure of local finance widely seen in regional cities where the population has fallen and aging has advanced. While still holding, as its city area, the population scale of the age when, as a strait port town, it drew people, its inside is shifting its center of gravity toward the elderly — Shimonoseki’s living-infrastructure numbers can be read as the figure of that transition in mid-course. These numbers, too, will be misread in meaning unless read together with their background.

Shimonoseki’s functions are born from its very position, the westernmost tip of Honshu. This position, facing Kyushu (Moji in Kitakyushu) across the Kanmon Strait, makes it the knot of Honshu and Kyushu. The bundle of structures crossing that strait by land — the Kanmon Railway Tunnel, the Kanmon Roadway Tunnel and the Kanmon Bridge — formed a corridor for coming and going between Honshu and Kyushu without relying on boats. Further, a port that recorded the nation’s top landings, and an accumulation of fisheries as a gathering place for pufferfish, have characterized this town as a town of the sea.

From the stage of the Battle of Dan-no-ura, to the port town of Akamagaseki City, and then to a strait town linked by land — the position "separating yet binding Honshu and Kyushu" has carried a different function age by age. The ancient node of conflict, the modern port, and the present-day undersea tunnels and bridge all rest, in origin, upon the same single waterway, the strait. A sea that separates yet also binds — that two-sidedness has drawn function after function to this town.