The Greater Tokyo Area is the third most populous metropolitan area in the world, consisting of the Kantà  region of Japan (including Tokyo Metropolis and the prefectures of Chiba, Gunma, Ibaraki, Kanagawa, Saitama, and Tochigi) as well as the prefecture of Yamanashi of the neighboring Chà «bu region. In Japanese, it is referred to by various terms, one of the most common being .
As of 2026, the United Nations estimates the total population at 36,954,512. It is the second-largest single metropolitan area in the world in terms of built-up or urban function landmass at , behind only the New York City metropolitan area at . With around US$1.8 trillion in GDP, Tokyo remains the second-largest metropolitan economy in the world, also behind New York.
There are various definitions of the Greater Tokyo Area, each of which tries to incorporate different aspects. Some definitions are clearly defined by law or government regulation, some are based coarsely on administrative areas, while others are for research purposes such as commuting patterns or distance from Central Tokyo. Each definition has a different population figure, granularity, methodology, and spatial association.
<small>Notes and sources: All figures issued by Japan Statistics Bureau, except for Metro Employment Area, a study by Center for Spatial Information Service, the University of Tokyo. Abbreviations: CF for National Census Final Data (every 5 years by JSB), CR for Civil Registry (compiled by local governments, monthly as per legal requirement), CP for Census Preliminary.</small>
The of Japan refers to the Greater Tokyo Area as defined by the of 1956, which defines it as "Tokyo and its surrounding area declared by government ordinance." The government ordinance defined it as Tokyo and all six prefectures in the Kantà  region plus Yamanashi Prefecture. While this includes all of Greater Tokyo, it also includes sparsely populated mountain areas as well as the far-flung Bonin Islands which are administered under Tokyo.
Using the "One Metropolis Three Prefectures" definition, Tokyo is , a similar size to that of Los Angeles County, and almost two-thirds smaller than the combined statistical area of New York City, at and 21.9 million people. Other metropolitan areas such as Greater Jakarta are considerably more compact as well as more densely populated than Greater Tokyo.
(populations listed for those over 300,000)
Tokyo is legally classified as a , which translates as "metropolis", and is treated as one of the forty-seven prefectures of Japan. The metropolis is administered by the Tokyo Metropolitan Government as a whole.
Central Tokyo, situated in the eastern portion of Tokyo Metropolis, was once incorporated as Tokyo City, which was dismantled during World War II. Its subdivisions have been reclassified as . The twenty three special wards currently have the legal status of cities, with individual mayors and city councils, and they call themselves "cities" in English. However, when listing Japan's largest cities, Tokyo's twenty three wards are often counted as a single city.
Western Tokyo, known as the Tama Area (Tama-chiiki å¤Âæ©å°åÂÂ) comprises a number of municipalities, including these suburban cities:
The core cities of the Greater Tokyo Area outside Tokyo Metropolis are:
The other cities in Chiba, Kanagawa and Saitama Prefectures are:
source: stat.go.jp census 2005
In the major metropolitan area (MMA) definition used by the Japanese Statistics Bureau, the following cities in Ibaraki, Tochigi, Gunma, Yamanashi, and Shizuoka Prefectures are included:
Tighter definitions for Greater Tokyo do not include adjacent metropolitan areas of Numazu-Mishima (approx. 450,000) to the southwest, Maebashi-Takasaki-Ã Âta-Ashikaga (approx. 1,500,000 people) on the northwest, and (approx. 1,000,000) to the north. If they are included, Greater Tokyo's population would be around 39 million. Takasaki-Maebashi is included as part of the Tokyo-Yokohama area in the definition of urban areas by Demographia.
At the center of the main urban area (approximately the first from Tokyo Station) are the 23 special wards, formerly treated as a single city but now governed as separate municipalities, and containing many major commercial centers such as Shinjuku, Shibuya, Ikebukuro and Ginza. Around the 23 special wards are a multitude of suburban cities which merge seamlessly into each other to form a continuous built up area, circumnavigated by the heavily travelled Route 16 which forms a (broken) loop about from central Tokyo. Situated along the loop are the major cities of Yokohama (to the south of Tokyo), Hachià Âji (to the west), à Âmiya (now part of Saitama City, to the north), and Chiba (to the east).
Within the Route 16 loop, the coastline of Tokyo Bay is heavily industrialised, with the Keihin Industrial Area stretching from Tokyo down to Yokohama, and the Keiyà  Industrial Zone from Tokyo eastwards to Chiba. Along the periphery of the main urban area are numerous new suburban housing developments such as the Tama New Town. The landscape is relatively flat compared to most of Japan, most of it comprising low hills.
Outside the Route 16 loop the landscape becomes more rural. To the southwest is an area known as Shà Ânan, which contains various cities and towns along the coast of Sagami Bay, and to the west the area is mountainous.
Many rivers run through the area, the major ones being Arakawa and Tama River.
Tokyo metropolitan area is the second largest metropolitan economy in the world only behind New York.
<small>Sources: Conversion rates â Exchange rates â OECD Data</small>
The Greater Tokyo Area has two major airports, Tokyo International Airport, commonly known as Haneda Airport (once chiefly domestic, now turning international) and Narita International Airport (chiefly international as well). Minor facilities include Chà Âfu and Ibaraki Airport. Tokyo Heliport serves helicopter traffic, including police, fire, and news. Japan Civil Aviation Bureau handles air traffic in large part but various military facilities handle air traffic in part: Hyakuri Air Base (Japan Air Self-Defense Force), Utsunomiya Air Field (Japan Ground Self-Defense Force), and Yokota Air Base (United States Air Force).
Greater Tokyo has an extensive railway network comprising high-speed rail, commuter rails, subways, monorails, private lines, trams and others. There are around 136 individual rail lines in the Greater Tokyo Area, and between 1,000 and 1,200 railway stations depending on one's definition of the area, most designed for heavy use, usually long enough to accommodate 10-car ( long) trains. Stations are designed to accommodate hundreds of thousands of passengers at any given time, with miles of connecting tunnels linking vast department stores and corporate offices. Tokyo Station has underground connections that stretch well over , and Shinjuku Station has well over 200 exits. Greater Tokyo's Railway Network is easily considered the world's largest in terms of both daily passenger throughput with a daily trips of over 40 million (20 million different passengers) as well as physical extent with approximately of track. Shinjuku station is used by an average of 3.34 million people per day, making it the world's busiest train station. Some 57 percent of all Greater Tokyo residents used rail as their primary means of transport in 2001.
JR East and many other carriers crisscross the region with a network of rail lines. The most important carriers include Keihin Kyà «kà  Electric Railway (Keikyà «), Keisei Electric Railway, Keià  Electric Railway, Odakyà « Electric Railway, Seibu Railway, Tà Âbu Railway, and Tà Âkyà « Corporation. In addition to Tokyo's two subway systems â Tokyo Metro and Tokyo Metropolitan Bureau of Transportation (Toei and Toden lines), Yokohama also has two subway lines.
The Tokyo Monorail provides an important shuttle service between Haneda Airport and Hamamatsucho station on the Yamanote line.
The Shuto Expressway system connects to other national expressways in the capital region.
Tokyo and Yokohama are major commercial seaports, and both the Japan Maritime Self-Defense Force and United States Navy maintain naval bases at Yokosuka.