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Public-images-osm logo.svg man_made = groyne
Dovercourt groynes - geograph.org.uk - 748828.jpg
A rigid structure built from a shoreline or riverbank that interrupts water flow and limits the movement of sediment. Show/edit corresponding data item.
Rendering in OSM Carto way
Rendering-man made breakwater.png
Rendering in OSM Carto area
Rendering-man made breakwater area.png
Group: man made
Used on these elements
should not be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Status: de facto

Use the man_made=groyne tag to mark a groyne (spelled groin in American English), which is a rigid structure stretching out a short distance from the shoreline or riverbank for the purpose of reducing the movement of sediment (eg sand and gravel) or sometimes to reduce ice-jamming.

Not to be confused with man_made=breakwater, which is used for structures designed primarily to create an area of calm water for mooring boats, or with man_made=pier, which is used for structures on which people walk over water to access boats or similar.

Another name for this structure is wing dam.

How to map

Create a linear way way along the length of the groyne. Tag with man_made=groyne.

Alternatively, create a sequence of linked ways with one or more additional tags on each section. For example:

  • submerged=yes - for the parts always submerged.
  • tidal=yes - for the parts submerged on high tide and above water on low tide.
  • height=* - height over seabed.

Very wide groynes (such as way 373881874) can be mapped as areas area by adding man_made=groyne and area=yes.




See also