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A megalopolis (sometimes called a megapolis; also megaregion, or supercity) is typically defined as a chain of roughly adjacent metropolitan areas. The term was used by Patrick Geddes in his 1915 book Cities in Evolution, by Oswald Spengler in his 1918 book, The Decline of the West, and Lewis Mumford in his 1938 book, The Culture of Cities, which described it as the first stage in urban overdevelopment and social decline. Later, it was used by Jean Gottmann in 1954, to describe the chain of metropolitan areas along the northeastern seaboard of the U.S. extending from Boston, Massachusetts through New York City, Philadelphia, Baltimore, and ending in Washington, D.C. and Northern Virginia. The latter is sometimes called the "BosWash megalopolis".

East Asia
China
Further information: Metropolitan regions of China
Pearl River Delta Megalopolis (珠江三角洲): (Hong Kong, Shenzhen, Dongguan, Guangzhou, Foshan, Jiangmen, Zhongshan, Zhuhai, Macau, Huizhou) (55,000,000), if Shantou/Quanzhou added (Guangdong Megalopolis) 70,000,000. If Hong Kong and other areas added, 120,000,000.
Yangtze River Delta Megalopolis (長江三角洲): (Shanghai, Nanjing, Hangzhou, Ningbo, Suzhou, Jingjiang, Wuxi, Changzhou, Zhenjiang, Yangzhou, Taizhou, Nantong, Huzhou, Jiaxing, Shaoxing, Jiangyin, Haimen, Zhangjiagang, Zhoushan, Ma'anshan) (88,000,000)
Bohai Economic Rim (环渤海经济圈): Beijing, Tianjin, Dalian, Anshan, Fushun, Dandong, Sinuiju, Tangshan, Yantai, Shenyang, Jinan, Qinhuangdao, Qingdao, Weihai (66,400,000)
South China Coast : Xiamen, Fuzhou, Wenzhou, Shantou, Jieyang, Chaozhou (25,000,000)
Central Plain (中原): Kaifeng, Xinxiang, Zhengzhou, Luoyang (14,170,000)
The central Liaoning city cluster in China. Within 150 km from its center Shenyang (7.2 million), it has Fushun (3 million), Anshan City (3.6 million), Benxi (1.5 million), Liaoyang (1.8 million), Yingkou (2.2 million), Panjin (1.2 million), and Tieling (3.4 million), with a total population of 23 million. And it can be further extended to Dalian (6.2 million), Fuxin (2 million) and Dandong (2.4 million). This area used to be the most industrialized region in China. It declined during 1980s-1990s, but in recent years, it has rapidly revived.
Northeastern Cities or the Harbin - Changchun Area (哈尔滨镠春地区): Harbin, Qiqihar, Daqing, Changchun, Jilin City, Siping including Rason in North Korea and Vladivostok in Russia (21,832,000)
Sichuan basin (四川盆地) or the Chengyu Megalopolis (成渝都市圈): Chengdu, Chongqing, Zigong, Luzhou (20,878,000)
Greater Wuhan Megalopolis (大武汉都市圈): Wuhan, Huangshi, Xinyang, Jiujiang, Yueyang (20,000,000)
Guanzhong (关中): Xi'an, Xianyang, Baoji, Weinan (16,722,000)
Greater Changsha Metropolitan region (镠株潭城市群): Changsha, Zhuzhou, Xiangtan(12,994,400 in 2000)
In July 2012, the Economist Intelligence Unit brought out a report entitled; Supersized cities: China’s 13 megalopolises, which pinpoints the 13 emerging megalopolises in China, and highlights the demographic and income trends that are shaping their development.

Japan
Taiheiyō Belt - Ibaraki, Saitama, Chiba, Tokyo, Kanagawa, Shizuoka, Aichi, Gifu, Mie, Osaka, Hyōgo, Wakayama, Okayama, Hiroshima, Yamaguchi, Kitakyūshū, Fukuoka, and Ōita in Japan. (80,000,000)[citation needed]
South Korea
Seoul National Capital Area - Seoul, Incheon, Suwon, Goyang, Yongin, Seongnam, and the rest of Gyeonggi-do: (25,000,000)
Southeast Economic Belt - Busan, Daegu, Pohang, Ulsan, Changwon, and the rest of South Gyeongsang Province: (8,500,000)
South Asia

Maharashtra - 1.Mumbai (also includes Thane, Navi Mumbai, Kalyan-Dombivali, Ulhasnagar, Vasai-Virar, Ambernath, Badlapur, and Panvel), 2.Pune (also includes Pimpri-Chinchwad), Aurangabad, Solapur, Nashik, Ahmednagar, Alibag (39,500,000)
Delhi National Capital Region and Jaipur (35,000,000)
South India - Hyderabad, Bengaluru and Chennai (Although widely separated geographically) (31,500,000)