Kashima Domain

 was a Japanese domain of the Edo period. It is associated with Hizen Province in modern-day Saga Prefecture. 
In the han system, Kashima was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields. In other words, the domain was defined in terms of "kokudaka", not land area. This was different from the feudalism of the West.
History.
Kashima domain was originally a sub-domain of the Saga Domain, founded in 1610 for Nabeshima Tadashige, the younger brother of the first "daimyō" of Saga Domain, Nabeshima Katsushige. Tadashige already had holdings of 5000 "koku" in what is now part of Katori District, Chiba, so the additional 20,000 "koku" from his brother made his total revenues 25,000 "koku". Tadashige’s son Nabeshima Masashige became second "daimyō" of Kashima; however, Masashige was dispossessed in 1642 when Kashima domain was given by Nabeshige Katsushige to his own 9th son, Nabeshima Naotomo. Masashige was allowed to keep his father’s original 5000 "koku" holdings, and was reduced to the status of "hatamoto". Naotomo’s line continued to rule Kashima until the Meiji Restoration, and was subject to the same "sankin-kōtai" regulations as other domains. However, Kashima was not allowed to build a proper castle, but instead only had a fortified house ("jin'ya"). After the abolition of the han system in 1871, the former final "daimyō", Nabeshima Naoyoshi became a viscount ("shishaku") under the "kazoku" peerage, and Kashima domain was absorbed into the new Saga Prefecture.
List of "daimyōs".
The hereditary "daimyōs" were head of the clan and head of the domain.
Geography.
The area of the han was roughly equivalent to modern-day city of Kashima in Saga Prefecture.