109th meridian west
{{Short description|Line of longitude}}
{{unsourced|date=December 2020}}
{{Location map-line|lon=-109}}
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The meridian 109° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
The 109th meridian west forms a great circle with the 71st meridian east.
In the United States, the western boundaries of Colorado and New Mexico and the eastern boundaries of Utah and Arizona lie on the 32nd meridian west from Washington, which is approximately 3 minutes of longitude west of the 109th meridian west of Greenwich, or approximately {{cvt|2.5|mi}}.
From pole to pole
Starting at the North Pole and heading south to the South Pole, the 109th meridian west passes through:
:
| class="wikitable plainrowheaders"
! scope="col" width="130" | Co-ordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes |
| valign="top"
| style="background:#b0e0e6;" | {{Coord|90|0|N|109|0|W|type:waterbody|name=Arctic Ocean}} ! scope="row" style="background:#b0e0e6;" | Arctic Ocean | style="background:#b0e0e6;" | Passing just east of Borden Island, Nunavut, Canada (at {{Coord|78|28|N|109|13|W|type:isle|name=Borden Island}}) |
| {{Coord|76|49|N|109|0|W|type:country|name=Canada}}
! scope="row" | Canada |
| style="background:#b0e0e6;" | {{Coord|75|53|N|109|0|W|type:waterbody|name=Sabine Bay}}
! scope="row" style="background:#b0e0e6;" | Sabine Bay | style="background:#b0e0e6;" | |
| {{Coord|75|29|N|109|0|W|type:country|name=Canada}}
! scope="row" | Canada |
| style="background:#b0e0e6;" | {{Coord|74|59|N|109|0|W|type:waterbody|name=Parry Channel}}
! scope="row" style="background:#b0e0e6;" | Parry Channel | style="background:#b0e0e6;" | Viscount Melville Sound |
| {{Coord|72|46|N|109|0|W|type:country|name=Canada}}
! scope="row" | Canada | Nunavut — Victoria Island |
| style="background:#b0e0e6;" | {{Coord|68|44|N|109|0|W|type:waterbody|name=Dease Strait}}
! scope="row" style="background:#b0e0e6;" | Dease Strait | style="background:#b0e0e6;" | |
| style="background:#b0e0e6;" | {{Coord|68|19|N|109|0|W|type:waterbody|name=Bathurst Inlet}}
! scope="row" style="background:#b0e0e6;" | Bathurst Inlet | style="background:#b0e0e6;" | |
| valign="top"
| {{Coord|68|0|N|109|0|W|type:country|name=Canada}} ! scope="row" | Canada | Nunavut — Lewes Island, the Stockport Islands and the mainland |
| valign="top"
| {{Coord|49|0|N|109|0|W|type:country|name=United States}} ! scope="row" | United States | Montana |
| valign="top"
| {{Coord|31|20|N|109|0|W|type:country|name=Mexico}} ! scope="row" | Mexico | Sonora |
| valign="top"
| style="background:#b0e0e6;" | {{Coord|25|26|N|109|0|W|type:waterbody|name=Pacific Ocean}} ! scope="row" style="background:#b0e0e6;" | Pacific Ocean | style="background:#b0e0e6;" | Passing just east of Clipperton Island (an overseas possession of France, at {{Coord|10|17|N|109|12|W|type:isle|name=Clipperton Island}}) |
| style="background:#b0e0e6;" | {{Coord|60|0|S|109|0|W|type:waterbody|name=Southern Ocean}}
! scope="row" style="background:#b0e0e6;" | Southern Ocean | style="background:#b0e0e6;" | |
| {{Coord|73|29|S|109|0|W|type:country|name=Antarctica}}
! scope="row" | Antarctica |