This town lies on the lower reaches of a river known for its clear flow. The craft of paper-making from the upstream mountains put down roots in this river’s basin, and the town has been known of old as a village of paper. On the side facing the sea is a harbor that became a base for bonito fishing, and it was known too for the making of dried bonito flakes. The clear stream of the river and the bonito of the sea. This town, opened to the blessings of both mountain and sea, now quietly loses population. Tosa’s numbers are the record of a town engraved by a village of paper on the lower reaches of a clear stream and a bonito harbor.
A plain city that opens on the right bank of the lower reaches of a river known for its clear flow, in the central part of Kochi Prefecture. The south faces the Pacific. The population has fallen gently from 30,338 in 2000 to 25,732 in 2020. What I (Atlas) want to read here is not the sign "a small city in Kochi," but the causal thread: how the history — a village of paper on the lower reaches of a clear stream and a bonito harbor — is translated into today’s population and finances.
01 · Seeing the present Tosa in its numbers
In the latest Population Census the population is about twenty-six thousand (25,732 in 2020). Its trend is a gentle decline. From 30,338 in 2000, through 30,011 in 2005, 28,686 in 2010, 27,038 in 2015, to 25,732 in 2020, it has fallen.
Looking inside, the figure of a village of the blessings of river and sea appears. The share aged 65 and over rose from 24.4% in 2000 to 36.8% in 2020, nearing four in ten. The household-with-children share was 18.9% (2020), and the Childcare Waitlist was zero in both 2024 and 2025. The Fiscal Capacity Index was 0.38 in fiscal 2023, a low-side level able to cover a little under four-tenths of expenditure with its own tax revenue. The figure of a village of paper on the lower reaches of a clear stream, losing population gently while advancing aging, appears in the numbers. Why it takes this shape cannot be read without going back over the history of the river’s paper and the bonito harbor.
Source: Population Census (Statistics Bureau, MIC) / Local Government Finance Survey, Fiscal Capacity Index (MIC) / Childcare Facility Status Report (Children and Families Agency) / Real Estate Information Library (MLIT)
02 · The lower reaches of a clear stream, a village of paper in the river’s basin, a harbor that chases bonito, a city status under a changed name — the history behind the numbers
This town’s skeleton is set by the terrain of the lower reaches of a river known for its clear flow, by the village of paper that put down roots in its basin, and by the bonito harbor facing the sea. The starting layer is the river. This town lies on a plain that opens on the right bank of the lower reaches of a river known for its clear flow, and the south faces the Pacific. The craft of paper-making from the upstream mountains, receiving the blessing of this river’s clear flow, put down roots in the basin, and the town has been known of old as a village of paper. Clear water and the handwork of paper were at the center of this town’s plain.
On the sea side of this river village, a bonito harbor opened. On the seaside of this town, facing the Pacific, a harbor opened at the mouth of a cove became a base for bonito fishing. It was known too for the making of dried bonito flakes, and in the hills the cultivation of fruit was carried on. The road by which it became a city mirrors this town too. After several towns and villages merged into a town, in the Showa 30s this land, to avoid overlap with a city of the same name in another prefecture, renamed itself with the name of the old province of this land and took city status. The lower reaches of a clear stream, a village of paper in the river’s basin, a harbor that chases bonito, and a city status under a changed name — this town’s shape stands upon the village-of-paper and bonito-harbor history held by the land of the lower reaches of a river known for its clear flow.
Source: Tosa City / Tosa washi (the Tosa paper village, where paper-making has long thrived under the blessing of the clear Niyodo River; a traditional craft — overview) / Tosa City / Usa Port (Usa Port at the mouth of Uranouchi Bay has long been a base for bonito fishing and is known for the making of dried bonito flakes; in the hills, the cultivation of fruit such as Tosa buntan — overview) / Tosa City (the Takaoka Plain on the right bank of the lower Niyodo River; in 1959 Takaoka Town, to avoid sharing its name with Takaoka City in Toyama Prefecture, renamed itself "Tosa City" and took city status; the south faces the Pacific, with Usa Port — overview)
03 · In a village of paper on the lower reaches of a clear stream, losing population gently and advancing aging
What characterizes Tosa is that, while holding the history of a village of paper on the lower reaches of a clear stream and a bonito harbor, it loses population gently and advances aging. From 30,338 in 2000 to 25,732 in 2020, about four thousand five hundred fell over twenty years. Even in this village supported by the clear stream of the river and the bonito of the sea, one can read that a part of the young generation moved to larger nearby cities, and the age of the whole town has risen. That the share aged 65 and over neared four in ten at 36.8% in 2020 is an expression of this.
On the other hand, the Childcare Waitlist was zero in both 2024 and 2025. The household-with-children share was 18.9% (2020). A Fiscal Capacity Index of 0.38 is a level able to cover a little under four-tenths of expenditure with its own tax revenue, on the low side. One can read that the scale of a small city in the central part, and the shift over time of the livelihoods of the river’s paper and the sea’s bonito, place the tax base on the low side. The village of paper on the lower reaches of a clear stream now, while losing population gently, advances aging. The population falls gently, aging nears four in ten at 36.8%, and a fiscal capacity of 0.38 is on the low side. The course by which a village opened to two blessings — the clear stream of the river and the bonito of the sea — nonetheless raised its age appears in these numbers.
Source: Population Census (Statistics Bureau, MIC) / Local Government Finance Survey, Fiscal Capacity Index (MIC) / Childcare Facility Status Report (Children and Families Agency)
04 · Paper the mountains made, and bonito the sea raised
Tosa’s livelihood was born from the blessings of both river and sea. One is the history in which, on the plain that opens on the right bank of the lower reaches of a river known for its clear flow, a village of paper put down roots through the blessing of that clear stream. Another is the character in which, with the south facing the Pacific, a harbor at the mouth of a cove became a base for chasing bonito and was known too for the making of dried bonito flakes.
The plain on the right bank of the lower reaches of a river known for its clear flow — this terrain rooted the craft of paper-making from the upstream mountains in the basin through the blessing of the clear stream, and opened a harbor chasing bonito on the seaside facing the Pacific. The craft of paper-making born in the upstream mountains, receiving the blessing of the clear stream, put down roots in the basin, and the town became a village of paper. On the side facing the sea, the Usa harbor chasing bonito opened, known too for dried bonito flakes. The river’s clear stream nurtures paper, the sea’s cove nurtures bonito. Two blessings, of mountain and sea, stand side by side in a single village.
Source: Tosa City / Tosa washi (the Tosa paper village, where paper-making has long thrived under the blessing of the clear Niyodo River; a traditional craft — overview) / Tosa City / Usa Port (Usa Port at the mouth of Uranouchi Bay has long been a base for bonito fishing and is known for the making of dried bonito flakes; in the hills, the cultivation of fruit such as Tosa buntan — overview) / Tosa City (the Takaoka Plain on the right bank of the lower Niyodo River; in 1959 Takaoka Town, to avoid sharing its name with Takaoka City in Toyama Prefecture, renamed itself "Tosa City" and took city status; the south faces the Pacific, with Usa Port — overview)
05 · Atlas’s note — the numbers of a village where the river’s paper and the sea’s bonito stand side by side
Lay out Tosa’s numbers and the indicators of a village opened to the blessings of river and sea line up: a gently falling population, an aging rate of 36.8%, a household-with-children share of 18.9%, and a fiscal capacity of 0.38. But with the habit of counting the pillars of revenue one by one, what I (Atlas) want to read here is the geographical structure in which this town is opened to the blessings of both mountain and sea — "a river of clear flow" and "a sea that chases bonito." The craft of paper-making from the upstream mountains, receiving the blessing of the clear stream, put down roots in the river’s basin, and the town became a village of paper. On the side facing the sea, a fishing harbor chasing bonito opened, known too for the making of dried bonito flakes. The river’s clear stream nurtures paper, the sea’s cove nurtures bonito. The structure in which two blessings, of mountain and sea, overlap in a single town explains well the making of Tosa’s livelihood.
The other thing I want to consider is the origin by which this town, to avoid overlap with a city of the same name in another prefecture, renamed itself with the name of the old province of this land and took city status. This land, which was a town of another name, in becoming a city chose the name of the old province to which this land belongs, to avoid confusion with a city of the same name. The way of choosing — taking on the name of the land’s old province as the city’s name — shows that this town laid a new name upon the history it had walked as a village of the blessings of river and sea. In the basin of the clear stream, paper is still made and dried, and at the Usa harbor, bonito are landed and become dried flakes. The blessing of water come down from the mountains, and the blessing of fish come up from the sea, are carried on separately, on the right and the left of a single village. The city’s name, taking on the name of the land’s old province, was placed upon the scene in which those two blessings stand side by side.
Source: Population Census (Statistics Bureau, MIC) / Tosa City / Tosa washi (the Tosa paper village, where paper-making has long thrived under the blessing of the clear Niyodo River; a traditional craft — overview) / Tosa City / Usa Port (Usa Port at the mouth of Uranouchi Bay has long been a base for bonito fishing and is known for the making of dried bonito flakes; in the hills, the cultivation of fruit such as Tosa buntan — overview) / Tosa City (the Takaoka Plain on the right bank of the lower Niyodo River; in 1959 Takaoka Town, to avoid sharing its name with Takaoka City in Toyama Prefecture, renamed itself "Tosa City" and took city status; the south faces the Pacific, with Usa Port — overview)
Editor’s note: all figures and sources are drawn from official statistics. The prose follows Atlas’s voice, and AI (atlas-handcrafted-reverse-v1 (Daiki 2026-06-02)) handled the shaping of the text. Evaluative or predictive language (such as “a good buy” or “attractive”) is intentionally left out. Revision id: wave22_0