Kinowasaku Stockade is the archaeological site of an ancient fortified administrative complex in Kinowa, Sakata, Yamagata Prefecture. It is believed to have been constructed from the late Nara period to the early Heian period, and is thought to have served as the provincial government center of ancient Dewa Province.
The site forms an almost square enclosure measuring approximately 720 meters on each side, covering an area of about 52 hectares. Archaeological investigations have uncovered the remains of government buildings, storehouses, residences, and other structures, making the site an important source of information about administration and everyday life in ancient Japan.
Today, the site has been developed as a historic park. As part of its preservation and restoration, the South Gate of the Government Complex, East Gate, and sections of the earthen walls have been reconstructed. Walking through the spacious grounds and viewing the restored structures offers visitors a chance to imagine what the Shonai region was like more than a thousand years ago.
The ruins of Kinowasaku were discovered in 1931. The following year, in 1932, they were designated a Historic Site of Japan, with additional areas receiving designation in 1981.
The outer enclosure formed a square approximately 720 meters on each side and was surrounded by earthen walls. A gate was positioned at the center of each side, while smaller tower-like structures were located near the four corners.
This carefully organized layout indicates that Kinowasaku was a large-scale administrative center planned according to the political and administrative system of ancient Japan.
Kinowasaku is located on the Arase River alluvial fan in the northern part of the Shonai region. The builders made effective use of the natural terrain, leveling an area around a natural embankment and raising the central section approximately one meter above the surrounding land before constructing the government complex.
From the gates located at the center of each side of the outer enclosure, broad roads approximately 9 meters wide extended toward the central government complex. The orderly arrangement of roads and buildings reflects the characteristics of government compounds established under Japan’s ancient Ritsuryo system, a system of laws and centralized administration modeled partly on institutions from East Asia.
At the center of the site was a government complex enclosed by earthen walls measuring approximately 115 meters on each side. Inside were the main hall, rear hall, and eastern and western side halls, arranged in a distinctive layout resembling the Japanese character “コ.”
Each side of the earthen enclosure had an eight-legged gate at its center. The carefully organized arrangement suggests that the complex was deliberately designed as the administrative and political heart of Dewa Province.
Archaeological excavations have revealed that the government complex went through approximately four major phases, based on changes in architectural style and construction methods.
During the first two phases, most buildings were horitate-bashira structures, in which wooden posts were set directly into holes dug in the ground. During the later two phases, buildings increasingly adopted foundation-stone construction, with wooden structures supported on stone bases.
During the final, fourth phase, the boundary surrounding the complex also changed from a wooden plank fence to an earthen wall. These discoveries show that the site was maintained, renovated, and modified over an extended period rather than remaining unchanged throughout its history.
Kinowasaku is believed to have been constructed during the late 8th century. At this time, conflicts between the imperial government and the Emishi, the people who lived in northeastern Japan and were viewed as outside the central government’s sphere of control, intensified.
As the political and administrative center of Dewa Province, the site would have played an important role in the governance of the region. In addition to the central government complex, the site contained storehouses, residences, and other facilities.
The enormous outer enclosure and carefully organized internal layout demonstrate the importance of Kinowasaku as a major administrative base in ancient Dewa.
In the early Heian period, the provincial government of Dewa is believed to have been relocated to an area corresponding to present-day Akita City. Following this relocation, Kinowasaku was eventually abandoned.
The surviving archaeological remains provide important clues for understanding the political and social conditions of northeastern Japan from the Nara period through the early Heian period. The arrangement of buildings, roads, and earthen walls revealed through archaeological research allows visitors to visualize the urban planning and administrative systems of ancient Japan.
Today, the Kinowasaku ruins feature reconstructed sections of the South Gate of the Government Complex, East Gate, and earthen walls. The combination of these reconstructed structures and the expansive historic park makes it easier to appreciate the scale and organization of the ancient site.
Walking through the approximately 720-meter-wide enclosure, visitors can imagine an ancient administrative center with its government complex at the heart and roads and other facilities systematically arranged around it.
Kinowasaku Ruins are the remains of a large-scale ancient administrative complex in present-day Sakata. Covering approximately 52 hectares, the site provides valuable insight into the political and administrative structure of ancient Dewa Province through its enormous scale and carefully planned layout.
As you explore the ruins and reconstructed South and East Gates and sections of the earthen walls, it is possible to imagine how government was organized and how people lived in the Shonai region more than 1,200 years ago.
Kinowasaku offers a very different historical experience from Sakata’s later port-city culture. For travelers interested in Japanese archaeology, ancient history, historic landscapes, and the development of government in northeastern Japan, this site provides a fascinating opportunity to encounter the history of ancient Tohoku.