The area of Tsubakimarai was a rural region of Tsukuba District of Hitachi Province noted as a major rice-growing region, with the exception of a small portion in the south, which belonged to Kitasōma District of Shimōsa Province.
Tsubakimarai was a countryside location in Tsukuba District of Hitachi Province, recognized for its significant rice cultivation. The area, with the exception of a southern portion, was under Kitasōma District in Shimōsa Province.