Jōkamachi in the context of Hagi, Yamaguchi

Hiroshima (広島市, Hiroshima-shi; English: /ˌhɪroʊˈʃiːmə/, also UK: /hɪˈrɒʃɪmə/, US: /hɪˈroʊʃɪmə/, Japanese: [çiɾoɕima] ) is the capital of Hiroshima Prefecture in Japan. As of June 1, 2019, the city had an estimated population of 1,199,391. The gross domestic product (GDP) in Greater Hiroshima, Hiroshima Urban Employment Area, was US$61.3 billion as of 2010. Kazumi Matsui has been the city's mayor since April 2011. The Hiroshima metropolitan area is the second largest urban area in the Chugoku Region of Japan, following the Okayama metropolitan area.

Hiroshima was founded in 1589 as a castle town on the Ōta River delta. Following the Meiji Restoration in 1868, Hiroshima rapidly transformed into a major urban center and industrial hub. In 1889, Hiroshima officially gained city status. The city was a center of military activities during the imperial era, playing significant roles such as in the First Sino-Japanese War, the Russo-Japanese War, and the two world wars.

Yonezawa (米沢市, Yonezawa-shi) is a city in Yamagata Prefecture, Japan. As of 1 February 2020, the city had an estimated population of 81,707 in 33,278 households, and a population density of 150 persons per km. The total area of the city is 548.51 square kilometres (212 sq mi). Yonezawa is most famous for its local delicacies (apples, Yonezawa beef, and carp) and for being a castle town that was once home to the Uesugi clan, including the daimyō Uesugi Yozan.

A castle town is a settlement built adjacent to or surrounding a castle. Castle towns were common in Medieval Europe. Some examples include small towns like Alnwick and Arundel, which are still dominated by their castles. In Western Europe, and England particularly, it is common for cities and towns that were not castle towns to instead have been organized around cathedrals.

Towns organized around Japanese castles are called jōkamachi (城下町). Castles are typically built near towns to gain and equip supplies.