Japanese archipelago

is the second-largest and northernmost of Japan's four main islands. Together with its surrounding islands, it comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaido from Honshu. The two islands are connected by railway via the Seikan Tunnel.

, historically known as or Hondo () , is the largest of Japan's four main islands. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the seventh-largest island in the world, and the second-most populous after the Indonesian island of Java.

is the third-largest and most southerly of Japan's four main islands. In the past, it has been known as , and . The historical regional name referred to Kyushu and its surrounding islands. Kyushu has a land area of and a population of 14,311,224 in 2018.

is the smallest of the four main islands of Japan. It is long and between wide. It has a population of 3.8 million, the least populated of Japan's four main islands. It is south of Honshu and northeast of Kyushu. Shikoku's ancient names include , , and , and its current name refers to the four former provinces that make up the island: Awa, Tosa, Sanuki, and Iyo.

East Asian archipelago in the North Pacific Ocean

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Japanese islands

thumb|Kameshima thumb|Kanejima, one of the many famous islands that dot the archipelago thumb|The view from Godaido thumb|Sagakei at Matsushima thumb|One of the islands of Matsushima thumb|One of the islands of Matsushima thumb|Chōmei-ana in Komonejima, about five meters in height, was known in folklore that people who passed through there in a pleasure boat would live three years longer. However it collapsed in the 2011 Tōhoku earthquake and tsunami|Sendai earthquake. thumb|Ojima whose name is Utamakura. The red "Togetsukyō Bridge", about twenty meters in length, was wholly lost in the Sendai

Parakaryon myojinensis, also known as the Myojin parakaryote, is a highly unusual species of single-celled organism known only from a single specimen, described in 2012. It has features of both prokaryotes and eukaryotes but is apparently distinct from either group, making it unique among organisms discovered thus far. It is the sole species in the genus Parakaryon. It is part of the domain Parakarya.

island group

group of islands in the Inland Sea, Japan