18th meridian west

The meridian 18° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Greenland, Iceland, the Atlantic Ocean, the Canary Islands, the Southern Ocean, and Antarctica to the South Pole.{{cite web |author=T. Vincenty |date=April 1975 |title=Direct and Inverse Solutions of Geodesics on the Ellipsoid with application of nested equation |url=http://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf |archive-url=https://www.webcitation.org/6DzvSBPa5?url=http://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf |archive-date=2013-01-28 |accessdate=2017-05-17 |language=en}}{{cite web |language =en |url =http://www.movable-type.co.uk/scripts/latlong-vincenty.html |title =Vincenty formula for distance between two Latitude/Longitude points |website= Movable type scripts|access-date=2017-05-17 | archive-date=2013-01-28 | archive-url =https://www.webcitation.org/6DzvScM3g?url=http://www.movable-type.co.uk/scripts/latlong-vincenty.html }}

The 18th meridian west forms a great circle with the 162nd meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 18th meridian west passes through:

class="wikitable plainrowheaders"

! scope="col" width="125" | Co-ordinates

! scope="col" | Country, territory or sea

! scope="col" | Notes

style="background:#b0e0e6;" | {{Coord|90|0|N|18|0|W|type:waterbody|name=Arctic Ocean}}

! scope="row" style="background:#b0e0e6;" | Arctic Ocean

| style="background:#b0e0e6;" |

valign="top"

| {{Coord|82|8|N|18|0|W|type:country|name=Greenland}}

! scope="row" | {{GRL}}

| Prinsesse Margrethe Island, Prinsesse Dagmar Island, and mainland

style="background:#b0e0e6;" | {{Coord|79|41|N|18|0|W|type:waterbody|name=Atlantic Ocean}}