Material：
Map Ja+Ko Major Cities in En
PDF
Map Ja+Ko Major Cities in Ja
PDF
Map Ja+Ko Major Cities in Ko
PDF
Map Ja+Ko Major Cities in Zhs
PDF
List Ja+Ko Major Cities
PDF
Commentary：
都市 (
Hiragana: とし
Romaji: To-shi) is the major cities.
The Japanese archipelago and the Korean peninsula are largely mountainous, and cities were built on limited plains.
The Japanese archipelago has a mountain range running through its center. There are many plains on the Pacific Ocean side in the southeast.
The Korean Peninsula has a mountain range running eastward. There are many plains on the Yellow Sea side to the west.
Further study：
Japan Ministry of Education (文部科学省).
学習指導要領 生きる力. 2017.
Republic of Korea Ministry of Education (대한민국
교육부).
People's Republic of China Ministry of Education (
中华人民共和国教育部). Tōngyòng Guīfàn Hànzì Biǎo (通用规范汉字表). 2013.
U.S. Department of Education (アメリカ合衆国教育省).