The International Map of the World (also called the Millionth Map, after its scale of 1:1000000) was a project to create a complete map of the world according to internationally agreed standards. Roads were depicted in red, towns and railways were depicted in black,
 and the labels were written in the Roman alphabet. The map was the brainchild of Albrecht Penck, a German geographer who first proposed it in 1891. The project gained traction in 1909 after a conference led by Great Britain, but some work had started earlier.
The Central Bureau of the Map of the World was established at the Ordnance Survey in London. After the Second World War, the United Nations took over the project. By 1953 only 400 of about 1000 sheets had been produced; though this covered most of the land surface outside North America, many sheets were decades out of date, and almost none of the open ocean was covered. In 1964, Arthur H. Robinson dismissed the IMW as "cartographic wallpaper" of no practical use. There were few updates thereafter, and in 1989, UNESCO declared the project was no longer feasible and stopped monitoring it.
Map indexing system
A map indexing system was developed for dividing the globe into sections spanning six degrees of longitude by four degrees latitude. Longitudinal slices are numbered 1 (180°–174° West) through 60 (174°–180° East). Latitudinal slices are named NA (0°–4° North) through NV (84°–88° North) and SA (0°–4° South) through SV (84°–88° South). For example,
- Map NJ-10 covers 36°–40°N, 120°–126°W including San Francisco at .
- SG-35 covers 24°–28°S, 24°–30°E including Johannesburg at .
- NL-38(below, right) covers 44°–48°N, 48°–54°E including Astrakhan at .
- NI-54 covers 32°–36°N, 138°–144°E including Tokyo at .
Due to shortening of longitudinal distances with increasing latitude, longitudinal span beyond 60 degrees latitude doubles to twelve degrees. Beyond 76 degrees it doubles again to 24 degrees.
- World Aeronautical Chart, another millionth world map
- World Map 1:2,500,000, a similar Soviet-Eastern Bloc project
- Digital Chart of the World, vector dataset
- Pearson, Alastair; Taylor, D. R. Fraser; Kline, Karen D.; Heffernan, Michael (2006). "Cartographic ideals and geopolitical realities: international maps of the world from the 1890s to the present". The Canadian Geographer. 50 (2): 149–176. doi:10.1111/j.0008-3658.2006.00133.x. ISSN 0008-3658.
- Pearson, Alastair W.; Heffernan, Michael (2 January 2015). "Globalizing Cartography? The International Map of the World, the International Geographical Union, and the United Nations". Imago Mundi. 67 (1): 58–80. doi:10.1080/03085694.2015.974956. ISSN 1479-7801.
- Walker, C. Lester. Lands and Peoples, Volume I: British Isles and Western Europe. New York: The Grolier Society. pp. 12–13.
- Matt Rosenberg. "International Map of the World". About.com. Archived from the original on 2012-04-07. Retrieved 2010-05-08.
- Great maps. [S.l.]: Dk Publishing. 2014. p. 212. ISBN 978-1-4654-2463-1.
- Pearson et al 2006, p.162
- Pearson et al 2006, p.163
- Robinson, A. H. (18 July 2013) . "The Future of the International Map". The Cartographic Journal. 2 (1): 23–26. doi:10.1179/caj.19220.127.116.11. ISSN 0008-7041.
- "The International Map of the World and its Numbering System". Retrieved 2011-06-26.
- NJ 10 San Francisco Bay (Map). 1:1 million. World (North America). U.S.A. Corps of Engineers. Army Map Service. 1962. Retrieved 2011-06-26 – via University of Texas Libraries.
- SG 35 Johannesburg (Map). World (Africa). Army Map Service. c. 1962 – via University of Texas Libraries.
- NI 54 Tokyo (Map). World (Asia). Army Map Service. 1957 – via University of Texas Libraries.
- "Topographic Maps". Retrieved 2011-06-26.
- "International Map of the World 1:1,000,000—List of map images in this collection:". University of Texas Libraries. University of Texas at Austin. Retrieved 2011-06-26.
- International Map of the World 1:1,000,000 index to scans at the Perry–Castañeda Library Map Collection
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