Owari Province in the context of "Yamauchi Kazutoyo"

Nagoya (名古屋市, Nagoya-shi; [naꜜ.ɡo.ja, -ŋo.ja, na.ɡo.jaꜜ.ɕi, -ŋo.jaꜜ.ɕi] , locally [na.ɡo.ja, -ŋo.ja]) is the capital and most populous city of Aichi Prefecture in Japan. It is the largest city in the Chūbu region, the fourth-most populous city in Japan (with a 2025 population of 2.3 million), and the principal city of the Chūkyō metropolitan area, which is itself the third-most populous metropolitan area in Japan (with a population of 10.11 million). Nagoya is located on the Pacific coast in central Honshu, and its seaport is the largest in Japan.

In 1610, the shogun Tokugawa Ieyasu moved the capital of Owari Province from Kiyosu to Nagoya. This period saw the renovation of Nagoya Castle. The early 1900s brought a convergence of economic factors that fueled rapid growth in the city during the Meiji Restoration, and it became a major industrial hub for the country as the area's automobile, aviation, and shipbuilding industries flourished; the traditional manufacturing of bicycles, sewing machines, and timepieces was thus followed by the production of ceramic, chemicals, oil, petrochemicals, and steel. These factors made Nagoya a target of American air raids during the Pacific War.

The Nōbi Plain (濃尾平野, Nōbi Heiya) is a large plain in Japan that stretches from the Mino area of southwest Gifu Prefecture to the Owari area of northwest Aichi Prefecture and extreme northern Mie Prefecture, covering an area of approximately 1,800 square kilometres (695 sq mi). It is an alluvial plain created by the Kiso Three Rivers (the Ibi, Kiso and Nagara rivers) and has very fertile soil. It is bordered on the west by the Ibuki and Yōrō mountain ranges, and to the east by the Owari Hills. Its northern border is marked by the Ryōhaku Mountains and the south by Ise Bay.

Ichinomiya (一宮; also 一の宮 or 一之宮; first shrine) is a Japanese historical term referring to the Shinto shrines with the highest rank in a province. Shrines of lower rank were designated ninomiya (二宮; second), sannomiya (三宮; third), shinomiya (四宮; fourth), and so forth.

The term gave rise to modern place names, such as the city of Ichinomiya, Aichi, named after Masumida Shrine in the former Owari Province.

Mikawa Province (三河国, Mikawa no Kuni; Japanese pronunciation: [mʲiꜜ.ka.wa (no kɯ.ɲi), mʲi.ka.waꜜ-]) was an old province in the area that today forms the eastern half of Aichi Prefecture. Its abbreviated form name was Sanshū (三州 or 参州). Mikawa bordered on Owari, Mino, Shinano, and Tōtōmi Provinces.

Mikawa is classified as one of the provinces of the Tōkaidō. Under the Engishiki classification system, Mikawa was ranked as a "superior country" (上国) and a "near country" (近国) in terms of its distance from the capital.

Mino Province (美濃国, Mino no Kuni; Japanese pronunciation: [mʲiꜜ.no (no kɯ.ɲi), mʲi.noꜜ-]) was a province of Japan in the area of Japan that is today southern Gifu Prefecture. Mino was bordered by Ōmi to the west, Echizen and Hida to the north, Shinano to the east, and Ise, Mikawa, and Owari to the south. Its abbreviated form name was Nōshū or Jōshū (濃州). Under the Engishiki classification system, Mino was ranked as one of the 13 "great countries" (大国) in terms of importance, and one of the "near countries" (近国) in terms of distance from the capital. The provincial capital and ichinomiya were located in what is now the town of Tarui.

Ise Province (伊勢国, Ise no Kuni; Japanese pronunciation: [iꜜ.se (no kɯ.ɲi)]) was a province of Japan in the area of Japan that is today includes most of modern Mie Prefecture. Ise bordered on Iga, Kii, Mino, Ōmi, Owari, Shima, and Yamato Provinces. Its abbreviated form name was Seishū (勢州).