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Data marked The World Factbook or TWF covers 198 countries and 55 territories, from the book published by the Central Intelligence Agency. In addition to coastline lengths, this is the source of the land area used to calculate the "coast/area ratio" for both TWF and WRI (see below) coastline measurement.
Dymaxion map of the world with the 30 largest countries and territories by area. This is a list of the world's countries and their dependencies, ranked by total area, including land and water. This list includes entries that are not limited to those in the ISO 3166-1 standard, which covers sovereign states and dependent territories.
The broken line measuring a coast does not extend in one direction nor does it represent an area, but is intermediate between the two and can be thought of as a band of width 2ε. D is its fractal dimension, ranging between 1 and 2 (and typically less than 1.5). More broken coastlines have greater D, and therefore L is longer for the same ε.
Data for multi-island countries like Japan seem to exclude interior coastlines. The total perimeter has the same length as the coastline, which is only true if you exclude coastline that is not also a national boundary. This would greatly reduce the coast/area ratios for such archipelagic countries, depending on how many islands they are made up.
The United Kingdom's coastline is more broken than coastlines of many other countries. It has a fractal or Hausdorff dimension or 'wiggliness' of 1.25, which is comparatively high; the Australian coastline for example has a fractal dimension of 1.13, and that of South Africa is 1.02.
The total coastline of the world is much less than the sum of all individual countries; Even though islands seem to be included in the coastline (explicitely mentioned for Canada), it is stated that Norway's coastline is 25k km (also explicitely counting small islands), but then the length of the island coastline alone is supposed to be 58k km
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