The domain was centered at the Kumamoto Castle in Kumamoto.
Under the Hosokawa, with an income of 540,000 koku, the Kumamoto domain was one of the largest in Kyushu, second only to the Satsuma Domain, and excluding the lands held by the Tokugawa and Matsudaira clans, the fourth-largest in Japan after the Kaga, Satsuma and Sendai domains [REF].