Geography of Japan

Japan is an archipelagic country made up of many islands stretching over 3,000 kilometers along the Pacific coast of East Asia. It has 14,125 islands in total, with the five largest being Hokkaido, Honshu, Kyushu, Shikoku, and Okinawa. These islands are mostly rugged and mountainous, with forests covering much of the land.

The country is the fourth-largest island country in the world and has a very long coastline. Japan sits on the edge of several moving pieces of Earth's crust, which causes frequent earthquakes and typhoons. The climate changes from cooler weather in the north to warmer, tropical areas in the south, allowing many different plants and animals to live there.

Japan reaches from about 20° to 45° north latitude and from 122° to 153° east longitude. It is surrounded by seas, with the Pacific Ocean to the east and other seas on its other sides. Because of its many islands and long coast, Japan has rich resources from the ocean and a lot of marine life in its surrounding waters. Most of Japan's people live on the largest island, Honshu, close to the coast where there are cities and flat areas.

Map of Japan

Main article: Regions of Japan

Japan is divided into eight regions, stretching from the northeast (Hokkaidō) to the southwest (Ryukyu Islands):

• Hokkaido
• Tōhoku region
• Kantō region
• Chūbu region
• Kansai (or Kinki) region
• Chūgoku region
• Shikoku
• Kyūshū

Each region includes several prefectures, except for Hokkaido, which is its own prefecture. These regions are not official government units but are commonly used for maps, weather reports, and business names.

Composition, topography and geography

Japan is a country made up of many islands. About 73% of it is covered in mountains, with mountain ranges running through each of the main islands. The highest mountain is Mount Fuji, which stands at 3,776 meters tall.

Because there is not much flat land, people often grow crops on the sides of hills and mountains near towns and cities. Japan sits above many volcanoes, so small earthquakes and occasional volcanic activity happen. Big, destructive earthquakes happen several times every hundred years. There are also many hot springs, which people enjoy for relaxation.

The land of Japan was measured to be 377,973.89 square kilometers as of July 1, 2021. The size changes a little because of volcanic eruptions, natural growth of islands, and land built by people.

Japan’s islands are far from the rest of Asia. The closest point to the Korean peninsula is about 190 kilometers away. China is about 800 kilometers away across the sea. Most people live along the Pacific coast of Honshū, while the west coast by the Sea of Japan has fewer people.

Long ago, during the Paleolithic period, there was a land bridge connecting Japan to Asia. But when sea levels rose later, the land bridge disappeared.

Japan’s location, surrounded by water and with rugged mountains, has helped protect it from invaders. Because of this, Japan sometimes chose to stay isolated from the rest of the world. For example, during the Edo period, Japan had rules called Sakoku that limited foreign contact.

Japan has never been fully taken over by another country, except once after World War II. The geography of islands played a big role in Japan’s history of being independent.

Japan has 108 active volcanoes, which is about 10% of the world’s active volcanoes. The many mountains and volcanoes are because Japan sits on several moving pieces of Earth’s surface called tectonic plates.

About 73 percent of Japan is mountainous, with long chains of mountains running down the middle of the islands. These divide the islands into two parts: one facing the Pacific Ocean with steep, tall mountains, and the other facing the Sea of Japan with plateaus and lower mountains.

Japan has several big flat areas called plains. The largest is the Kantō Plain around Tokyo. Other important plains include the Nōbi Plain near Nagoya and the Osaka Plain around Osaka. These plains are where many people live, work, and grow food.

Hokkaido, the northernmost island, also has large plains such as the Ishikari Plain and the Tokachi Plain. These areas are great for farming.

Japan’s rivers are usually steep and fast, so most are not good for boats except near where they meet the sea. The longest river is the Shinano River, which is 367 kilometers long.

One of Japan’s largest lakes is Lake Biwa, located near Kyoto. It is very old—about 4 million years—and home to many kinds of plants and animals, including special fish found only there.

Japan’s coastlines have many natural harbors, especially along the Pacific south of Tokyo. North of Tokyo and along the Sea of Japan, the coast is mostly straight with few harbors.

Over time, people in Japan have built out land from the sea through a process called land reclamation. This created new areas for buildings, factories, and airports. Some famous examples include Kansai International Airport and the area of Odaiba in Tokyo.

Oceanography and seabed of Japan

Japan has a very large area of ocean, about 4,470,000 km² (1,730,000 mi²). This makes Japan one of the countries with the most ocean space. The ocean around Japan has many different depths, from very shallow to very deep. Some parts of the ocean floor have underwater mountains that sometimes reach up to become islands. There are also deep trenches in the ocean, such as the Kuril–Kamchatka Trench, Japan Trench, and Izu–Ogasawara Trench.

The ocean and seabed around Japan are home to many sea creatures and important minerals. Deep under the water, there are valuable minerals like manganese nodules and cobalt.

Geology

Main article: Geology of Japan

Tectonic plates

The Japanese archipelago formed over many millions of years due to the movement of tectonic plates. These movements created the islands we see today.

Japan's islands sit on several tectonic plates. The Okhotsk Plate holds the northern parts, including Hokkaido and the upper half of Honshu. The Amurian Plate holds the southern half of Honshu, Shikoku, and most of Kyushu. The Okinawa Plate holds the southern tip of Kyushu and the Ryukyu islands. The Philippine Sea Plate holds the Nanpō Islands.

The Pacific Plate and the Philippine Sea Plate are moving under other plates. This movement pulled Japan eastward and helped form the Sea of Japan. These movements also cause frequent earthquakes and volcanic activity, making Japan part of the Pacific Ring of Fire.

Median Tectonic Line

The Japan Median Tectonic Line is Japan's longest fault system. It runs from Ibaraki Prefecture through central Honshū to near Nagoya, then continues to Shikoku and Kyūshū.

Oceanic trenches

East of Japan are three deep oceanic trenches. The Kuril–Kamchatka Trench lies off Kamchatka and meets the Japan Trench east of Hokkaido. The Japan Trench extends from the Kuril Islands to the northern Izu Islands and is where the Pacific Plate moves under the Okhotsk Plate. The Izu–Ogasawara Trench is south of the Japan Trench and is where the Pacific Plate moves under the Philippine Sea Plate.

Growing archipelago

Japan's land is always changing because of moving tectonic plates, earthquakes, and active volcanoes. Over time, new land can form. For example, in the early 1900s, a new volcano appeared on the island of Hokkaido. In 2013, an eruption created a small island in the Pacific Ocean that later joined with an existing island.

Big earthquakes, like the one in 2011, can also change the shape of Japan's land. The shaking moved parts of the country's coast closer to North America and changed the height of the sea floor. These changes show how Japan's geography is always growing and shifting.

Sea of Japan

Main article: Sea of Japan

The Sea of Japan is a large body of water with a surface area of 978,000 km². It has a mean depth of 1,752 m and a maximum depth of 3,742 m. The sea has a carrot-like shape, stretching from southwest to northeast, with a wide southern part that narrows toward the north. Its coastal length is about 7,600 km, with Russia having the longest coastline along the sea.

The Sea of Japan has three major basins: the Yamato Basin in the southeast, the Japan Basin in the north, and the Tsushima Basin in the southwest. The Japan Basin is the deepest part of the sea, while the Tsushima Basin is the shallowest. The sea’s continental shelves are wide on the eastern shores of Japan but narrow on the western shores along Korea and Russia.

Ocean currents

Japan's islands are surrounded by eight important ocean currents.

The Kuroshio is a warm current that flows northward along the west side of the Ryukyu Islands and the east coasts of Kyushu, Shikoku, and Honshu. It starts near the Philippines and carries warm water toward the polar regions.

The Tsushima Current is a branch of the Kuroshio that flows into the Sea of Japan. The Oyashio is a cold current that flows southward along the east coast of Hokkaido and northeastern Honshu, meeting the Kuroshio to help create the North Pacific Current. Other currents include the Liman Current, which flows southward in the Sea of Japan, and the Tsugaru Warm Current and Sōya Warm Current, which flow along the north coast of Hokkaido.

Natural resources

Main articles: Energy in Japan and Mining in Japan

Japan has small amounts of coal, oil, iron, and minerals, but it needs to import most of its energy and raw materials. After an oil crisis in 1973, Japan worked on using energy more efficiently. For food, Japan can grow enough rice by itself, but for many other foods, it must import them.

Japan’s waters hold many underwater resources like natural gas and rare minerals. However, mining these deep-sea resources is very difficult and has not yet begun. Japan also has a big fishing industry and catches a lot of fish each year.

As of 2011, Japan got most of its energy from petroleum, coal, and natural gas. Nuclear power used to provide a lot of electricity, but after a big disaster in 2011, all nuclear plants were turned off. Since then, Japan has depended more on imported fuels. The country is now working on using more renewable energy like wind and solar power.

National Parks and Scenic Beauty

Japan has 34 special nature areas called National Parks and 56 other areas called Quasi-National Parks. These places help protect the beautiful landscapes and wildlife. They are managed by the government to make sure people can enjoy them without harming the environment.

Japan has many different kinds of nature, from cold forests in the north to warm, tropical plants in the south. Some areas have tall mountains in the middle and flat lands along the coast. Special places are chosen to protect important natural sights and historic views. There are also three famous views in Japan that many people visit to see beautiful scenery.

Climate

Main article: climate of Japan

Japan has many different climates due to its varied geography. Most parts of Japan, like Honshu, Shikoku, and Kyushu, have four clear seasons and a warm, wet climate. In northern Hokkaido, the climate is cooler, while in the southern islands such as the Yaeyama Islands and Minami-Tori-shima, it is warmer and more like a rainforest. The country's landscapes create six main climate zones: Hokkaido, the Sea of Japan area, the Central Highlands, the Seto Inland Sea, the Pacific Ocean coast, and the Ryukyu Islands. The hottest temperature ever recorded in Japan was 41.8 °C (107.2 °F) on August 5, 2025, and the coldest was −41.0 °C (−41.8 °F) in Asahikawa on January 25, 1902.

Population distribution

Main article: Demographics of Japan

See also: List of cities in Japan

Japan has a population of 126.3 million people. It is the eleventh-most populous country and the second-most populous island country in the world. Most people live in cities along the coast, plains, and valleys. In 2010, about 91% of Japan's people lived in cities. About 80 million people live on the Pacific coast of Honshu.

Most of Japan's population lives on Honshu Island. About a third of all Japanese people live in the Greater Tokyo Area. Many also live in the Kanto, Kinki, and Chukyo areas.

Honshu

Honshū is the largest island of Japan and the second most populous island in the world. It has a population of 104 million people. Honshu is about 1,300 km long and ranges from 50 to 230 km wide. The Greater Tokyo Area on Honshu is the largest metropolitan area in the world, with about 38 million people.

Kyushu

Kyushu is the third-largest island of Japan. As of 2016, Kyushu has a population of nearly 13 million people.

Shikoku

Shikoku is the second-smallest of the five main islands. It has a population of about 3.8 million people.

Hokkaido

Hokkaido is the second-largest island of Japan. It has a population of about 5.4 million people and the lowest population density of the main islands.

Okinawa Prefecture

Okinawa Prefecture is the southernmost part of Japan. It has a population of about 1.4 million people. Okinawa Island is the smallest of the five main islands.

Nanpō Islands

Nanpō Islands are groups of islands south and east of Japan's main islands. They are all part of Tokyo Metropolis.

Taiheiyō Belt

The Taiheiyō Belt is a large area including the Greater Tokyo Area and the Keihanshin area. It is almost 1,200 km long, from Ibaraki Prefecture in the northeast to Fukuoka Prefecture in the southwest. It has a total population of about 82 million people.

• Taiheiyō Belt – includes Ibaraki, Saitama, Chiba, Tokyo, Kanagawa, Shizuoka, Aichi, Gifu, Mie, Kyoto, Osaka, Hyōgo, Wakayama, Okayama, Hiroshima, Yamaguchi, Fukuoka, and Ōita. (81,859,345 people)
  • Greater Tokyo Area – Part of the larger Kantō region, broadly includes Tokyo and Yokohama. (38,000,000 people)
  • Keihanshin – Part of the larger Kansai region, includes Osaka, Kyoto, and Kobe. (19,341,976 people)

Underwater habitats

There are plans to build underwater habitats in Japan's area of the ocean. Currently, no underwater city has been built yet. For example, the Ocean Spiral by Shimizu Corporation would have a floating dome 500 meters in diameter with hotels, homes, and shops. It could be 15 km long. This would allow mining of the seabed, research, and production of methane from carbon dioxide with tiny living things. The Ocean Spiral was developed with JAMSTEC and Tokyo University.

Extreme points

Main article: Extreme points of Japan

Japan stretches from 20° to 45° north latitude, from Okinotorishima to Benten-jima, and from 122° to 153° east longitude, from Yonaguni to Minami Torishima. These are the farthest points north, south, east, and west in Japan.

Japan's main islands

The five main islands of Japan are Hokkaido, Honshū, Kyūshū, Shikoku, and Okinawa. These islands are also known as the mainland, and all these places can be visited by the public.

Largest islands of Japan

Main articles: List of islands of Japan, List of islands of Japan by area, and Japanese archipelago

These are the 50 largest islands of Japan. It excludes the disputed Kuril Islands, known as the northern territories.

Northern Territories

Main article: Kuril Islands dispute

Japan has a long-standing claim to the Southern Kuril Islands (Etorofu, Kunashiri, Shikotan, and the Habomai Islands). These islands were taken by the Soviet Union in 1945. The Kuril Islands were once part of Japan. They were first home to the Ainu people and later controlled by the Japanese Matsumae clan during the Edo Period. Japan believes these islands should still be theirs.

Geographically, the Kuril Islands extend from the northeast of Hokkaido. Kunashiri and the Habomai Islands can be seen from the northeastern coast of Hokkaido. Japan considers the northern territories part of the Nemuro Subprefecture of Hokkaido Prefecture.

Time zone

Main article: Japan Standard Time

Japan has only one time zone, which is 9 hours ahead of UTC. This time zone is used across all of Japan's islands, including Minami-Tori-shima, which is far to the southeast of Tokyo. Some nearby places, like Sakhalin and the Northern Territories, use a different time zone, even though they are close to Japan.

Natural hazards

Earthquakes and tsunami

See also: List of earthquakes in Japan

Japan often experiences earthquakes, tsunamis, and volcanoes because it sits along the Pacific Ring of Fire. Many earthquakes happen each year, and some can be strong enough to shake buildings. Undersea earthquakes can cause tsunamis, large waves that can flood coastal areas.

Big earthquakes and tsunamis have happened many times in history. The 2011 Tōhoku earthquake was very powerful and caused a large tsunami that affected Japan’s northeastern coast. Earthquakes can also affect land that has been built out into the water, so special building rules help keep people safe.

Japan is a leader in studying earthquakes and has built tall buildings that can withstand shaking. People practice what to do in an earthquake, especially to stay safe from fires that can start after the shaking stops.

Volcanic eruptions

See also: List of volcanoes in Japan

Japan has many active volcanoes, more than any other country in the world. These volcanoes are near where Earth’s plates meet and move. Some new volcanoes have appeared in recent years.

Mount Fuji is a famous volcano that last erupted in 1707. It sent ash far away, covering places with a thick layer of dust. Japan also has very large volcanoes called calderas, with Mount Aso being the largest. These huge volcanoes can erupt powerfully, sending ash and rock far and wide.

Scientists watch these volcanoes closely to try to predict eruptions. They study underground activity to help keep people safe. Even with technology, stopping a big eruption is very hard, but scientists are always looking for new ways to protect people.

Typhoons

Main article: Typhoons in Japan

Japan gets many typhoons each year, especially in Okinawa, which feels them the most. These strong storms can bring heavy rain and wind. In the past, typhoons caused many accidents, but today, better buildings, warnings, and rescue teams help keep people safer.

Winter snow can also cause problems in some areas, leading to landslides and flooding.

Environmental issues

Main article: Environmental issues in Japan

Japan faces several important environmental challenges. One big issue is global warming and protecting the ozone layer. The country also works to keep its air, water, and soil clean. Managing waste and recycling properly is another key focus. Japan also pays attention to handling chemicals safely and protects its natural surroundings. The nation takes part in working with other countries to address these environmental concerns.