How Many Islands Does Japan Have? Four Main Islands and Thousands More

Japan's official island count more than doubled after a modern recount, and every one of those islands adds to the country's charm.

Published October 20, 2026 at 2:41 PM JST | By Tokyo Paul

Quick answer: Japan has 14,125 islands according to a 2023 recount by the Geospatial Information Authority of Japan, which replaced an older figure of 6,852 from 1987. Four main islands, Honshu, Hokkaido, Kyushu and Shikoku, hold most of the land and people, and Okinawa Island is often described as a fifth. The rest are smaller islands, many of them uninhabited.

Ask a Japanese person how many islands their country has and you may get a smile, because the answer has changed in recent years. Japan is an archipelago stretching a long way from north to south, with coastlines that range from snowy shores to coral reefs. This guide explains the official count, why the number grew, how the four main islands differ, and how visitors can explore the smaller islands that make the map so interesting.

What is the official number of islands in Japan?

The official number is 14,125, based on a recount published by the Geospatial Information Authority of Japan in 2023. Before that, the standard figure was 6,852, which came from a survey carried out by the Japan Coast Guard in 1987. Both counts used the same rule, which counts only islands with a coastline of at least 100 meters.

The new total does not mean Japan gained any land or territory. It means that the country has a much more detailed picture of the islands it already had. For travelers, the number is a fun fact and a reminder of how varied Japan's geography is, from busy urban coasts to tiny islets that few people ever see.

Why did the number of islands double?

The number doubled because mapping technology improved. The 1987 count was compiled by hand from paper charts, and it often treated small groups of islets as one. The 2023 recount used advanced digital mapping, checked against aerial photographs, and could pick out far smaller features along the coast.

The newer survey also found islands that the earlier one had not covered, such as some in lakes and rivers and sandbanks in river mouths. International law recognizes naturally formed land that stays above water at high tide as an island, but there is no single worldwide standard for counting them, so numbers can differ depending on the method. That is why geographers sometimes say the true total depends on how an island is defined.

What are the four main islands?

The four main islands are Honshu, Hokkaido, Kyushu and Shikoku. Honshu is by far the largest, at roughly 228,000 square kilometers, and it is home to Tokyo, Kyoto, Osaka and most of the country's major cities. Hokkaido in the north covers about 83,000 square kilometers, Kyushu in the southwest about 37,000, and Shikoku, the smallest of the four, about 19,000.

Together these islands make up the great majority of Japan's land and population. Honshu, Kyushu and Shikoku surround the Seto Inland Sea, a calm stretch of water dotted with smaller islands. Each of the four has its own character, from Hokkaido's wide-open landscapes and seafood to Kyushu's hot springs and Shikoku's pilgrimage tradition.

Is Okinawa one of the main islands?

Okinawa Island is often called the fifth major island, even though the traditional count is four. At about 1,200 square kilometers, it is the fifth largest island in the country and the heart of Okinawa Prefecture. Many geography summaries list five main islands for this reason.

Okinawa belongs to the Ryukyu Islands, a long chain that curves south and west toward Taiwan. The prefecture includes the Okinawa Islands, Miyako, Ishigaki, Iriomote and many others, each with turquoise water and its own local traditions. This is why Okinawa feels like a different world from the mainland, with its own cuisine, music and history.

How many of Japan's islands are inhabited?

Only a small share of Japan's islands have residents, with around 260 commonly cited as inhabited. The rest are quiet, uninhabited islets that are home to birds, plants and wildlife. Some are sacred places, some are lighthouse sites and some are simply rocks sticking out of the sea.

The inhabited islands include places of very different sizes, from the four main islands with millions of residents to small fishing communities with only a few hundred people. Visiting one of these smaller islands is a lovely way to see Japanese life at a slower pace. Local ferries, small inns and home-style seafood are all part of the experience.

How much of Japan is mountainous?

About seventy-three percent of Japan is mountainous, which is why the cities and farmland cluster on narrow coastal plains. The Japanese Alps, formed by the Hida, Kiso and Akaishi ranges, rise in the middle of Honshu, and the highest summits there top three thousand meters. Mount Fuji, at 3,776 meters, is the tallest peak in the country.

The country's total area is about 378,000 square kilometers, and its coastline stretches roughly 29,700 kilometers. That long shoreline is one reason seafood plays such a big role in Japanese cooking. It also explains why you can find beaches, harbors, cliffs and fishing towns almost everywhere you travel.

Which small island groups are worth knowing?

Several island groups stand out for their scenery and culture. The Izu Islands, south of Tokyo, are volcanic and offer hiking, diving and hot springs, while the distant Ogasawara Islands are known for rare native species and a World Heritage listing. In the Seto Inland Sea, islands such as Naoshima and Shodoshima combine art, olive groves and relaxed local life.

In the far southwest, the Yaeyama and Kerama Islands attract visitors with clear water and coral. Small places such as Aoshima and Tashirojima have become well known for their friendly cats. Each of these island groups can be a satisfying trip on its own, or a gentle extension to a visit to a main city.

How can visitors explore Japan's islands?

Visitors can reach many islands by ferry, bridge or short flight, and the options are easy to research ahead of time. Several Seto Inland Sea islands are a short boat ride from the mainland, while Okinawa and the southwest islands are linked by regular flights. Ferry timetables and weather affect schedules, so it is wise to check official operators for current information and allow some flexibility.

A good plan for first-time island visitors is to choose one or two islands rather than many, so there is time to enjoy local food and scenery. Small islands may have limited shops and lodging, so booking accommodation in advance and carrying some cash are sensible steps. The reward is a warm welcome and views that feel very far from the busy city.

Frequently Asked Questions

How many islands does Japan have in 2026?

Japan's official count is 14,125 islands, based on the 2023 recount by the Geospatial Information Authority of Japan. Before that, the long-standing figure was 6,852 from a 1987 survey. Both counts include only islands with a coastline of 100 meters or more, so smaller features are not included.

What are Japan's four main islands?

The four main islands are Honshu, Hokkaido, Kyushu and Shikoku. Honshu is the largest and includes Tokyo, Kyoto and Osaka. Okinawa Island, part of the Ryukyu chain in the far southwest, is often described as a fifth major island, although it is not one of the traditional four.

Why did Japan's island count change so much?

The count changed because mapping tools improved. The earlier survey in 1987 used paper maps and often grouped small islets together, while the 2023 recount used advanced digital mapping and aerial photographs. The newer method identified many more small islands, including some in lakes, rivers and sandbanks, without changing the country's territory.

Keep Exploring

More guides from Tokyo Paul: Shodoshima: The Olive Island of the Seto Inland Sea, Ogasawara Islands: Tokyo's Distant World Heritage Archipelago and Ishigaki and the Yaeyama Islands: Okinawa's Far Southern Charm.