The Danube is very thoroughly marked by kilometer posts along the bank, counting down from KM2411 at Kelheim, Germany, to zero at Sulina, Romania, on the Black Sea. KM Post 2410 is the first on the navigable Donau river, near Kelheim, Germany. The style will vary in other countries; sometimes the first two digits are smaller and only the last two digits are large enough to be easily read, as in the third photo, at KM1653 in Slovakia.
EuroCanals Guides utilize the format KM2410.0L, KM2187.0R or KM1653.0R. The letters R/L indicate that the object is on the right or left bank, as seen when looking downstream.
Rivers of the Danube route:
Donau river, Germany KM2390
The Danube begins in the Black Forest of Germany and is navigable from Kelheim, Bavaria for 2412 kilometers to Sulina, Romania, passing through ten countries and four capital cities. Access from the major cities of western Europe was made possible in 1992 by the completion of the Main-Donau Kanal to form a link across the European continental divide. This has opened up the primary waterway route from the North Sea to the Black Sea for commercial barges, river cruise ships and recreational boaters.
Click on the map below for details of each river section.
The river descends through three sections, each with its own characteristics: