On 2019-02-16 14:46, Eugene Podshivalov wrote: > Calculated value may differ from the official one ...
Official according to whom? From https://en.wikipedia.org/wiki/Nile#cite_note-length-1 : /"The length of the Nile is usually said to be about 6,650 km (4,130 mi), but reported values lie anywhere between 5,499 km (3,417 mi) and 7,088 km (4,404 mi). The length measurements of many rivers are only approximations and differ from each other because there are many factors that determine the calculated river length, such as the position of the geographical source and the mouth, the scale of measurement, and the length measuring techniques"/ From https://en.wikipedia.org/wiki/Amazon_River : "/The Amazon River ... in South America is the largest river by discharge volume of water in the world, and //*by some definitions*//it is the longest./" (/my emphasis/) Encyclopedias are the preferred source for this kind of information, not maps (or GIS databases). Sergio
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