|waterway = milestone|
|A stone or metal marker denoting the distance traveled along a waterway.|
|Group: Inland navigation|
|Used on these elements|
|Status: In use|
|Tools for this tag|
|This tag page is a stub. You can help OpenStreetMap by expanding it.
Similar pages for structural reference: Tag:railway=tram, Tag:waterway=dock.
Used for a distance marker along a waterway. Use distance=* to record the distance on the marker. Default distance is kilometers. The direction can be different for example the river Rhein is counted from Konstanz to the river mouth, the river Donau is counted from the mouth to its spring.
A more detailed system for navigational use is defined in the Openseamap: OpenSeaMap/Distance_Marks