Former Japanese colonies

South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and the Sea of Japan to the east. South Korea claims to be the sole legitimate government of the entire peninsula and adjacent islands. It has a population of about 52 million, of which half live in the Seoul metropolitan area, the ninth most populous metropolitan area in the world, with other major cities being Busan, Daegu, and Incheon.

Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main island of Taiwan, also known as Formosa, lies between the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. It has an area of , with mountain ranges dominating the eastern two-thirds and plains in the western third, where its highly urbanized population is concentrated. The combined territories under ROC control consist of 168 islands in total covering . The largest metropolitan area

North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korean Peninsula and borders China and Russia to the north at the Yalu (Amnok) and Tumen rivers, and South Korea to the south at the Korean Demilitarized Zone (DMZ). The country's western border is formed by the Yellow Sea, while its eastern border is defined by the Sea of Japan. Pyongyang is the capital and largest city.

Palau, officially the Republic of Palau, is an island country located in the Micronesia subregion of Oceania in the western Pacific Ocean. The Republic of Palau consists of approximately 340 islands and is the western part of the Caroline Islands, while the eastern and central parts make up the Federated States of Micronesia.

The Marshall Islands, officially the Republic of the Marshall Islands, is an archipelagic country in Oceania. The sovereign state lies west of the International Date Line and north of the equator in the Micronesia region of the Northwestern Pacific Ocean.

The Federated States of Micronesia, or simply Micronesia, is an island country in Micronesia, a region of Oceania. The federation encompasses the majority of the Caroline Islands and consists of four states—from west to east: Yap, Chuuk, Pohnpei, and Kosrae—that span the western Pacific just north of the equator for a longitudinal distance of almost 2,700 km (1,700 mi). Together, the states comprise around 607 islands and a combined land area of approximately 702 km2 or 271 sq mi.

unincorporated territory of the US located in the Pacific

Sakhalin (, ) is an island in Northeast Asia. Its north coast lies off the southeastern coast of Khabarovsk Krai in Russia, while its southern tip lies north of the Japanese island of Hokkaido. An island of the West Pacific, Sakhalin divides the Sea of Okhotsk to its east from the Sea of Japan to its southwest. It is administered as part of Sakhalin Oblast and is the largest island of Russia, with an area of . The island has a population of roughly 500,000, the majority of whom are Russians. The indigenous peoples of the island are the Ainu, Oroks, and Nivkhs, who are now only present in very

island chain located in Northeast Asia administered by Russia

archipelago of tiny islands in the western Pacific Ocean, divided between the Federated States of Micronesia and Palau

Japanese colonial period in Chōsen (Korea), 1910–1945

period of Taiwanese history (1895–1945)

mandate in Oceania issued by the League of Nations to Japan following WWI

former prefecture of Japan on southern Sakhalin island

Japanese possession in Northeastern China until the end of World War II

Japanese military rule over Singapore (1942–1945)

3.7 year occupation of Hong Kong during World War II by the Japanese Empire

1942–1945 Japanese occupation of the Philippines during WWII

Japanese territorial conquests (1895–1945)