# The Oldest Layer of the Izumo World (Miyoshi)｜JIHAN JINKO

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# The Oldest Layer of the Izumo World

The Miyoshi Basin, joined to the Sea of Japan by the Gonokawa River, is presented as an ancient crossroads within the Izumo cultural sphere.

2026.05Hiroshima Prefecture, Where Three Worlds Meet (Bihoku)

## 課題Issue

The north of the prefecture is seen as remote inland country, and the meaning of the basin's many tombs goes untold.

## 視点Approach

Some four thousand tombs and an early example of the four-cornered Yosumi mound reveal the basin's ties to the Sea of Japan world.

## 施策Proposals

- A Crossroads Map of the rivers and tomb clusters
- Walking among the tombs at the Miyoshi Fudoki no Oka park
- A journey to Izumo by the Geibi Line and the Gonokawa← All plans


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## The Oldest Layer of the Izumo World（Miyoshi・Hiroshima）

The Miyoshi Basin, joined to the Sea of Japan by the Gonokawa River, is presented as an ancient crossroads within the Izumo cultural sphere.

Issue
The north of the prefecture is seen as remote inland country, and the meaning of the basin's many tombs goes untold.
Approach
Some four thousand tombs and an early example of the four-cornered Yosumi mound reveal the basin's ties to the Sea of Japan world.
Proposals
A Crossroads Map of the rivers and tomb clusters; Walking among the tombs at the Miyoshi Fudoki no Oka park; A journey to Izumo by the Geibi Line and the Gonokawa

## Question: how to make kofun burial mounds a tourism experience

Seen one by one, burial mounds do not tell why they stand where they do. Takahiro Mitsui (三井崇央), representative of JIHAN JINKO, has built up tourism plans that show the rows of tombs as an area, through their relation to vanished seas and rivers.

In Kibi, Okayama, he restored the ancient inland sea, showed the Tsukuriyama and Sakuzan tombs as a line along its shore, and added mounds visitors can climb and an on-site link sharing the progress of the Sakuzan excavation (from September 2025 to 2030). In a plan written for Sakai City, he built a mystery walk for local primary school children and their parents that rereads the Mozu tombs through the eyes of those arriving by sea. Makimuku and Hashihaka in Nara, the four-cornered mounds of Miyoshi in Hiroshima, and the "tombs shown to the sea" of Tango were planned in the same way. This meets the Basic Plan's use of historical and cultural resources for tourism.

For regional tourism planning, multilingual reach and AI search, JIHAN JINKO takes enquiries: https://jihanjinko.com/en/contact

Read further: https://jihanjinko.com/en/services/tourism

## Question: hiroshima tourism beyond the peace park and miyajima

For Hiroshima Prefecture, Takahiro Mitsui (三井崇央), representative of JIHAN JINKO, wrote an overview and three regional plans that draw Hiroshima not as one prefecture but as the meeting ground of three worlds, the Inland Sea, Izumo and Kibi, to create circuits across the whole prefecture.

Bingo is Fukuyama's "Ana no Umi" and Tomonoura; Aki walks Hiroshima City's hills as former islands, toward Miyajima; Bihoku draws Miyoshi, joined to the Sea of Japan by the Gōnokawa River, as the oldest layer of the Izumo cultural sphere with its four-cornered mounds, linked to Izumo by the JR Geibi Line. The overview joins the three with a "meeting ground map" and builds a flow in which someone who came to one area learns of the others and returns. Links across the borders with Okayama and Shimane are included. This meets the Basic Plan's thinking on repeat visitors and regional circuits.

For regional tourism planning, multilingual reach and AI search, JIHAN JINKO takes enquiries: https://jihanjinko.com/en/contact

Read further: https://jihanjinko.com/en/services/tourism#hiroshima

Enquiries：https://jihanjinko.com/en/contact