Largest Islands of Japan

Geography

Japan comprises 14,125 islands that extend along the Pacific coast of Asia. It stretches over 3000 km (1900 mi) northeast–southwest from the Sea of Okhotsk to the East China Sea. The country's five main islands, from north to south, are Hokkaido, Honshu, Shikoku, Kyushu and Okinawa. The Ryukyu Islands, which include Okinawa, are a chain to the south of Kyushu. The Nanpō Islands are south and east of the main islands of Japan. Together they are often known as the Japanese archipelago. As of 2019, Japan's territory is 377,975.24 km2 (145,937.06 sq mi). Japan has the sixth-longest coastline in the world at 29,751 km (18,486 mi). Because of its far-flung outlying islands, Japan's exclusive economic zone is the eighth-largest in the world, covering 4,470,000 km2 (1,730,000 sq mi).

History

Modern humans arrived in Japan around 38,000 years ago (~36,000 BC), marking the beginning of the Japanese Paleolithic. Around 14,500 BC (the start of the Jōmon period), a Mesolithic to Neolithic semi-sedentary hunter-gatherer culture characterized by pit dwelling and rudimentary agriculture emerged. Clay vessels from the period are among the oldest surviving examples of pottery. The Japonic-speaking Yayoi people later entered the archipelago from the Korean Peninsula, intermingling with the Jōmon people. The Yayoi period saw the introduction of innovative practices including wet-rice farming, a new style of pottery, and metallurgy from China and Korea.

Demographics

Japan has a population of nearly 123 million, of whom almost 119 million are Japanese nationals; foreign residents make up the remainder, estimated at 3,743,000 as of September 2025. Japan is one of the world's fastest aging countries and has the highest proportion of elderly citizens of any country, comprising one-third of its total population; this is the result of a post–World War II baby boom, which was followed by an increase in life expectancy and a decrease in birth rates.

Japan has a total fertility rate of 1.2, which is below the replacement rate of 2.1, and is among the world's lowest: it has a median age of 48.4, the highest in the world. As of 2025, over 29.3% of the population is over 65, or more than one in four out of the Japanese population.

Economy

Japan has the world's fourth-largest economy by nominal GDP, after that of the United States, China and Germany; and the fifth-largest by PPP-adjusted GDP. As of 2023, Japan's labor force is the world's tenth-largest, consisting of over 69.2 million workers. As of 2025, Japan has a low unemployment rate of around 2.5%. Its poverty rate is the second highest among the G7 countries, and exceeds 15.7% of the population. Japan has the highest ratio of public debt to GDP among advanced economies, with a national debt estimated at 237% relative to GDP as of 2026.

Geography

Shikoku Island, comprising Shikoku and its surrounding islands, covers about 18,800 square kilometres (7,259 sq mi) and consists of four prefectures: Ehime, Kagawa, Kōchi, and Tokushima. Across the Seto Inland Sea lie Wakayama, Osaka, Hyōgo, Okayama, Hiroshima, and Yamaguchi Prefectures on Honshu. To the west lie Ōita and Miyazaki Prefectures on Kyushu.

Shikoku is ranked as the 50th largest island by area in the world. Additionally, it is ranked as the 23rd most populated island in the world, with a population density of 193 inhabitants per square kilometre (500/sq mi).

Mountains running east and west divide Shikoku into a narrow northern subregion, fronting on the Seto Inland Sea, and a southern part facing the Pacific Ocean.

History

The Oki Islands have been inhabited since the Japanese Paleolithic era, and numerous artifacts from the Jōmon, Yayoi and Kofun periods have been found by archaeologists, indicating continuous human occupation and activity.

The islands were organized as Oki Province under the Ritsuryō reforms in the latter half of the seventh century, and the name “Oki-no-kuni” appears on wooden markers found in the imperial capital of Nara. The islands are mentioned in the Nara period chronicles Kojiki and Nihon Shoki, and Dōgo Island was the location of the capital of ancient Oki Province.

During the late Heian period, due to its remoteness, Oki Province came to be known as a place for political exile.

Geology

The Oki Islands are volcanic in origin, and are the exposed eroded summits of two massive stratovolcanoes dating approximately 5 million years ago to the Tertiary and Quaternary periods.

Dōgo to the east is the largest island in area, and has the highest elevation, Mount Daimanji, at 608 metres (1,995 ft) above sea level. The Dōzen group of islands to the west are all portions of a single ancient volcanic caldera which collapsed, leaving three large islands (Nishinoshima, Nakanoshima and Chiburijima) and numerous smaller islands and rocks in a ring formation surrounding a central lagoon.

The archipelago is approximately 40-80 kilometres (43 nmi) north of the Honshu coast at its closest point.

Climate

Summers (June–August) average around 30 degrees Celsius plus humidity. There usually is a strong sea breeze. The sea waves during the summer rarely exceed 2 meters.

Autumn (September–November) is temperate. It begins to rain more often and the waves begin to grow.

Winters (December to the end of February) are relatively mild. Temperatures rarely drop below freezing. Also, due to the warming influence of the sea, Oki does not get much snow and any snow does not lie for long because the ground is not cold enough. The ferry is more likely to be canceled due to high waves, but it is still possible to leave the island. The Rainbow fast ferry stops operating in December.

Spring (March–May) is generally regarded as the best season.

Geography

Okinawa is the fifth largest island of Japan. The island has an area of 1,206.99 square kilometers (466.02 sq mi). The coastline is 476 kilometers (296 mi) long. The straight-line distance is about 106.6 kilometers (66.2 mi) from north to south. Okinawa is in the northeastern end of Okinawa Prefecture. Since 1972 over 1,000 hectares (2,500 acres) of land has been added via reclamation (0.83% of the island's total area).

It is roughly 640 kilometres (400 mi) south of the main island of Kyushu. Okinawa is connected to nearby islands near a land bridge: Katsuren Peninsula is connected via the Mid-Sea Road to Henza Island, Miyagi Island, Ikei Island, and Hamahiga Island.

History

Early Okinawan history is defined by midden or shell heap culture and is divided into Early, Middle, and Late Shell Mound periods. The Early Shell Mound period was a hunter-gatherer society, with the wave-like opening Jōmon pottery. In the latter part of this period, archaeological sites moved near the seashore, suggesting the engagement of people in fishing. On Okinawa, rice was not cultivated until the Middle Shell Mound period. Shell rings for arms made of shells obtained in the Sakishima Islands, namely Miyakojima and Yaeyama islands, were imported by Japan. In these islands, the presence of shell axes from 2,500 years ago suggests the influence of a southeastern-Pacific culture.

Demographics

In September 2009, the Japanese government estimated the population to be 1,384,762, which included American military personnel and their families. The Okinawan language, called Uchināguchi, is spoken by adults only, but several local groups promote the use of the Okinawan language by younger people.

Whereas the northern half of Okinawa Island is sparsely populated, the south-central and southern parts of the island are markedly urbanized—particularly the city of Naha and the urban corridor stretching north from there to Okinawa City. The population distribution is approximately 120,000 in northern Okinawa, 590,000 in central Okinawa and 540,000 in southern Okinawa. It has a high population density of 1,014.93/km2.

Economy

Among the prefectures of Japan, Okinawa has the youngest and fastest-growing population but has the lowest employment rate and average income. The island economy is primarily driven by tourism and the U.S. military presence, with efforts in recent years to diversify into other sectors.

Other significant contributors to the economy include public utilities and public works, as well as, to a lesser extent, telecommunications (Okinawa Cellular Telephone), and alcoholic beverages (Orion Breweries).

The Motobu Peninsula has a large-scale quarry and cement factory, taking advantage of the limestone in the area. There is also agriculture with tropical fruit such as Malpighia emarginata.

Geography

Amami Ōshima is the seventh-largest island in the Japanese archipelago after the four main islands, Okinawa Island and Sado Island (excluding the disputed Kuril Islands). It is located approximately 380 kilometres (210 nmi) south of the southern tip of Kyūshū and 250 kilometres (130 nmi) north of Okinawa. The island is of volcanic origin, with Mount Yuwanda at 605 metres (1,985 ft) above sea level at its highest peak. The coast of the island is surrounded by a coral reef, and the island may also have been home to some of the northernmost coral reefs in Japan during the last glacial period. It is surrounded by the East China Sea on the west and the Pacific Ocean on the east.

History

It is uncertain when Amami Ōshima was first settled. Stone tools indicate settlement in the Japanese Paleolithic period, and other artifacts, including pottery, indicate a constant contact with Jōmon, Yayoi and Kofun period Japan.

The island is mentioned in the ancient Japanese chronicle Nihon Shoki in an entry for the year 657 AD. During the Nara period and early Heian period it was a stopping place for envoys from Japan to the court of Tang dynasty China. Mother of pearl was an important export item to Japan. Between 1571 and 1611, Amami Ōshima was briefly incorporated as part of the Ryukyu Kingdom as it expanded northwards along the archipelago. As Ryukyu was a tributary vassal of Ming China, this changed the status of the island as well.

Climate

The climate of Amami Ōshima is classified as a humid subtropical climate (Köppen climate classification Cfa) with very warm summers and mild winters. The rainy season lasts from May through September. The island is subject to frequent typhoons.

Economy

The economy of Amami Ōshima is based on agriculture (sugar cane, rice and sweet potatoes), commercial fishing, and the distillation of shōchū. The favorable climate allows for two rice crops a year. Seasonal tourism is also an important part of the economy.

Traditional crafts on the island include the production of high quality hand-crafted silk called Ōshima-tsumugi which is mainly used to make kimono. Along with Persian carpets and Gobelin tapestries, is said to be one of the world's three great textiles.

Ōshima-tsumugi is dyed with mud to create their characteristic black color.

Geography

Iwo Jima has an approximate area of 21 km2 (8 sq mi; 5,189 acres). The most prominent feature is Mount Suribachi on the southern tip, a vent that is thought to be dormant and is 161 m (528 ft) high. Named after a Japanese grinding bowl, the summit of Mount Suribachi is the highest point on the island. Iwo Jima is unusually flat and featureless for a volcanic island. Suribachi is the only obvious volcanic feature, as the island is only the resurgent dome (raised centre) of a larger submerged volcanic caldera surrounding the island. The island forms part of the Kazan-retto islands Important Bird Area (IBA), designated by BirdLife International.

History

The island was first visited by a Westerner in October 1543, by Spanish sailor Bernardo de la Torre on board the carrack San Juan de Letrán when trying to return from Sarangani to New Spain.

Before World War II Iwo Jima was administered as Iōjima village and was (and is today) part of Tokyo. A census in June 1943 reported an island civilian population of 1,018 (533 males, 485 females) in 192 households in six settlements. The island had a primary school, a Shinto shrine, and one police officer; it was serviced by a mail ship from Haha-jima once a month, and by Nippon Yusen ship once every two months.