The Konda Kanga ruins (金田官衙遺跡, Konda kanga iseki) is an archaeological site with the ruins of a Nara to Heian period government administrative complex located in what is now the Kaneda and Higashioka neighborhoods of the city of Tsukuba in Ibaraki prefecture in the northern Kantō region of Japan. The site has been protected as a National Historic Site from 2004.[1]
In the late Nara period, after the establishment of a centralized government under the Ritsuryō system, local rule over the provinces was standardized under a kokufu (provincial capital), and each province was divided into smaller administrative districts, known as (郡, gun, kōri), composed of 2–20 townships in 715 AD.[2] Each of the units had an administrative complex, or kanga (官衙遺跡) built on a semi-standardized layout based on contemporary Chinese design.
The Konda Kanga ruins are located on the edge of a plateau, approximately 15 kilometers south of Mount Tsukuba, overlooking the east side of the alluvial lowland in the Sakuragawa basin that extends from the foot of Mount Tsukuba towards Lake Kasumigaura. The ruins were discovered during expansion work on the schoolyard of Sakura Junior High School in 1959. The traces of several pillared building foundations along with a large amount of carbonized rice was found. Per an archaeological excavation in 1984, the platforms for the central building and a large quantity of roof tiles were uncovered. Further excavations were conducted in 1999 and 2002, which confirmed the layout to be that of a local administrative center, presumably that of ancient Kawachi-gun in Hitachi Province.[3]
The ruins consist of three separate areas:
It appears that the site was occupied from the eighth through the end of the ninth centuries. It is uncertain when the complex was abandoned. The site was backfilled after excavation, and is now an empty field located about 15 minutes by car from Tsukuba Station on the Tsukuba Express.[3] The Hirasawa Kanga ruins are located 9 kilometers to the northwest.
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