The Ōhama Domain (大浜藩, Ōhama-han) was a Japanese domain of the Edo period. It was associated with Shinano Province in modern-day Nagano Prefecture.
In the han system, Ōhama was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields.[1] In other words, the domain was defined in terms of kokudaka, not land area.[2] This was different from the feudalism of the West.
The domain only existed for a few years. It ended in 1777.[citation needed]
The hereditary daimyō was head of the clan and head of the domain. In Ōhama, the sole daimyō of Ōhama was Mizuno Tadatomo. Tadatomo had been a high-income hatamoto with holdings in the Saku district of Shinano Province He was a page and later an assistant to the 10th shōgun, Tokugawa Ienari.[citation needed] In 1768, Mizuno became a head of the han of over 10,000 koku.[3]
Tadatomo's family was later transferred to the Numazu Domain;[citation needed] and a cadet branch of the Mizuno clan remained at Numazu until the Meiji Restoration.[4]
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