| +/- man_made=pier
A pier is a raised walkway over water, supported by widely spread piles or pillars.
The man_made=pier tag is used for a raised walkway over water supported by pillars made of metal/wood or steel, or floating and secured using chains (see wikipedia:Pier). Also referred to in some places as a 'jetty', 'raft' or 'dock'. Definition ('Pier, Jetty'). "A long, narrow structure extending into the water to afford a berthing place for vessels, to serve as a promenade, etc." (International Hydrographic Organization, IHO Dictionary, S-32, 5th Edition)
Piers can range in scale from very light structures providing a small small pedestrian walkway, through to large solid structures with fixed piles extending over a mile out to sea.
How to map
Most piers can be mapped as a open way for the length of the pier tagged with man_made=pier, wider piers should be tagged as an area. The shore end of the pier should be terminated on a node shared with the coastline or the riverbank and should not extend onto shore. Use shared nodes where piers connect to other piers over the water.
A floating pier. Add float=yes
Related terms: <slip> <wharf> <dock> <pier> <buttress> <promenade>