[Historical Geography of Japan] Why Was Kyoto the Capital for Over a Thousand Years? — The Kyoto Basin and Feng Shui
Today, the capital of Japan is Tokyo.
However, for much of Japanese history, Kyoto served as the country’s political and cultural center.
After Emperor Kanmu moved the capital to Heian-kyo (平安京) in 794, Kyoto remained the seat of the emperor and the imperial court for approximately 1,075 years, until Emperor Meiji relocated his residence to Tokyo in 1869.
Of course, with the rise of the Kamakura, Muromachi, and Edo shogunates, the center of actual political power shifted among cities such as Kamakura, Kyoto, and Edo. In particular, after Tokugawa Ieyasu established the shogunate in Edo in 1603, the effective center of political power moved to Edo.
Nevertheless, Kyoto remained Japan’s traditional imperial capital, home to the emperor and the imperial court.
So why did Japan retain Kyoto as its capital for such a remarkably long period?
The answer was not simply tradition.
A closer look at Kyoto’s basin geography, the mountains and rivers surrounding the city, its transportation networks, and the influence of feng shui and Onmyōdō (陰陽道)—systems of cosmological thought that shaped spatial planning in premodern East Asia—helps explain why Kyoto was able to maintain its special status for more than a millennium.
1. Why Did Emperor Kanmu Choose Heian-kyo in 794?
Kyoto emerged as the center of imperial Japan in 794.
That year, Emperor Kanmu moved the capital from Nagaoka-kyo to a new city called Heian-kyo (平安京), marking the beginning of what would later become Kyoto (Kyoto City, 2022).
Heian-kyo was not built at random.
At the time, Japan had been strongly influenced by Chinese political institutions, culture, and urban planning. Heian-kyo was therefore constructed as a carefully planned capital, modeled in significant part on Chang’an (長安), the great imperial capital of China’s Tang dynasty.
The city was laid out in a grid pattern, with streets running north–south and east–west. At the northern end of the city stood the Daidairi (大内裏), the imperial palace and government complex.
From this position, the emperor symbolically ruled the capital while facing south.
However, Chinese influence was not limited to the city’s physical layout.
When selecting the site for the new capital, the surrounding mountains and rivers, cardinal directions, and overall topography were also considered important factors.
2. Kyoto and Feng Shui — A City of the Four Guardian Deities
In ancient Japan, feng shui and cosmological ideas based on yin-yang and the Five Elements, introduced from China, significantly influenced urban planning and perceptions of space.
One concept particularly associated with Kyoto is Shijin Sōō (四神相応), the principle of arranging a place in harmony with the Four Guardian Deities (Cheon, 2016).
The Four Guardian Deities were believed to protect the four cardinal directions:
The Azure Dragon (青龍) in the east, the White Tiger (白虎) in the west, the Vermilion Bird (朱雀) in the south, and the Black Tortoise (玄武) in the north.
In later traditional interpretations, the terrain and transportation routes surrounding Heian-kyo were believed to correspond to the principles of Shijin Sōō (四神相応), or harmony with the Four Guardian Deities.
Mountains lay to the north, waterways connected to the Kamo River system flowed to the east, a transportation route leading toward the San’indō (山陰道) extended to the west, and relatively open lowlands and waterways stretched out to the south.
Kyoto is particularly surrounded by mountains like a natural wall to the north, with the Higashiyama mountains to the east and the Nishiyama mountains to the west.
Kyoto, therefore, was not simply a city built on an open plain. It occupied a distinctive landscape in which mountains and waterways surrounded and shaped the urban area.
There is, however, an important point to keep in mind.
Today, the Four Guardian Deities of Kyoto are often identified in the following way:
North — Black Tortoise (Genbu): Mount Funaoka
East — Azure Dragon (Seiryū): Kamo River
West — White Tiger (Byakko): San’indō Road
South — Vermilion Bird (Suzaku): Ogura Pond
However, it is difficult to conclude that Emperor Kanmu officially established these precise one-to-one correspondences when the capital was moved to Heian-kyo in 794.
It is therefore reasonable to associate Kyoto with ideas derived from feng shui, yin-yang cosmology, and Onmyōdō. At the same time, some of the specific correspondences between Kyoto’s landscape and the Four Guardian Deities that are widely known today appear to include interpretations that were systematized in later periods (Cheon, 2016).
3. Kyoto’s Geography — The Kyoto Basin Surrounded by Mountains
Kyoto’s distinctive geographical setting becomes even clearer when viewed on a map.
The urban area of Kyoto lies within the Kyoto Basin (京都盆地).
The Higashiyama mountains rise to the east, the Nishiyama mountains to the west, and mountainous terrain extends across the north. As a result, Kyoto is enclosed by mountains on three sides—east, west, and north—while the landscape opens more broadly toward the south (Agency for Cultural Affairs, 1993).
This geographical setting provided the capital with a certain degree of natural separation from surrounding regions.
The mountains and narrow approaches limited the routes through which large forces could easily advance toward the city, while also creating clear geographical boundaries around the capital.
However, it would be an exaggeration to describe Kyoto as an impregnable natural fortress where simply defending the southern approach could prevent any large army from entering.
In fact, Kyoto experienced numerous wars and periods of political turmoil throughout Japanese history (Agency for Cultural Affairs, 1993).
One of the most notable examples was the Ōnin War (応仁の乱) in the 15th century. Kyoto became the center of prolonged fighting during the conflict, and large parts of the city were severely devastated.
In other words, although Kyoto’s basin setting and surrounding mountains may have provided certain defensive advantages, military defensibility alone cannot explain why Kyoto remained Japan’s imperial capital for more than a thousand years.
A more convincing explanation lies in a combination of factors: its relatively stable geographical setting, long-established political traditions, the presence of the emperor and the aristocratic court, its concentration of religious institutions and cultural authority, and its connections to important transportation networks.
4. The Price of Being Surrounded by Mountains — Hot Summers and Cold Winters
Although the Kyoto Basin offered several advantages for a capital, its geography also came with disadvantages.
One of the most notable is its distinctive basin climate.
Because Kyoto is surrounded by mountains on three sides, air circulation can be limited, contributing to hot and humid conditions during the summer.
Kyoto’s intense summer heat remains famous throughout Japan even today.
In contrast, during winter, cold air can settle and remain trapped within the basin, making the city quite cold.
Although Kyoto’s average winter temperatures are relatively mild and broadly comparable to those of Korea’s southern coastal regions, its basin geography can make the cold feel more penetrating. Surrounded by mountains, the basin can trap cold air, while damp conditions can add to the sensation of chill.
For this reason, Kyoto’s climate is often described in Japan with a simple phrase:
“Hot in summer and cold in winter.”
In a sense, the beautiful mountains that helped define Japan’s imperial capital for more than a thousand years also brought harsh seasonal conditions to the people who lived there.
5. Kyoto, a City of Water — The Kamo and Katsura Rivers
Beautiful mountains alone were not enough to sustain a capital.
A large urban population required reliable supplies of water and food, as well as networks capable of continuously transporting goods and other necessities.
In this respect, Kyoto enjoyed relatively favorable geographical conditions.
Several rivers flow through the Kyoto Basin, including the Kamo River (鴨川) and the Katsura River (桂川).
These rivers supplied water for agriculture and everyday life, providing an essential foundation for farming and urban development in the Kyoto Basin.
To the south of Kyoto, these waterways eventually connect with the Yodo River (淀川) system.
Following the Yodo River downstream leads to the Osaka Plain and Osaka Bay, giving Kyoto access to one of western Japan’s most important commercial and maritime regions.
In particular, Fushimi (伏見), located south of central Kyoto, and the water transportation network along the Yodo River later developed into an important logistical corridor connecting Kyoto and Osaka (Japan Tourism Agency, 2019).
During the Edo period, Osaka grew into one of Japan’s largest centers of commerce and distribution, making this transportation network even more important.
Rice and other goods gathered from across Japan could be transported through Osaka and then onward to Kyoto, while various products made in Kyoto could also be distributed to other parts of the country through the same network.
Kyoto was therefore an inland city surrounded by mountains, but it was never isolated from the outside world.
The mountains enclosed the city, while rivers and roads connected Kyoto to the wider world.
This balance between geographical enclosure and external connectivity was one of Kyoto’s important advantages.
6. So Why Did Japan Keep Kyoto as Its Capital for More Than a Thousand Years?
Ultimately, there is no single explanation for why Kyoto remained Japan’s imperial capital for such a long period.
First, the Kyoto Basin was surrounded by mountains while still providing a relatively broad area suitable for building and sustaining a major city.
Second, an extensive network of rivers, including the Kamo and Katsura rivers, provided water for everyday life and agriculture.
Third, land and river transportation routes extending southward connected Kyoto with the Osaka Plain and the Seto Inland Sea, giving the inland capital access to wider commercial and transportation networks.
Fourth, from the perspective of feng shui and cosmological ideas based on yin-yang and the Five Elements introduced from China, Kyoto’s combination of mountains and waterways could be interpreted as an ideal setting for an imperial capital.
More important than any of these factors, however, was the authority that Kyoto itself accumulated over the centuries.
The emperor and the imperial aristocracy lived there, numerous Buddhist temples and Shinto shrines were established throughout the city, and generations of scholarship, art, religion, and traditional culture became deeply rooted in Kyoto.
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