78th meridian west
The meridian 78° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Atlantic Ocean, the Caribbean Sea, Panama, South America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.

The 78th meridian west forms a great circle with the 102nd meridian east.

From Pole to Pole
Starting at the North Pole and heading south to the South Pole, the 78th meridian west passes through:

{| class="wikitable plainrowheaders"
! scope="col" width="120" | Co-ordinates
! scope="col" | Country, territory or sea
! scope="col" | Notes
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Arctic Ocean
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Ellesmere Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Baffin Bay
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Ellesmere Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Baffin Bay
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Bylot Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Eclipse Sound
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Baffin Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Foxe Basin
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Koch Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Foxe Basin
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Foxe Peninsula, Baffin Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Foxe Channel
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — unnamed island just west of Mill Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Foxe Channel
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Nottingham Island
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Foxe Channel
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Nunavut — Digges Islands
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Hudson Bay
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Quebec — Ungava Peninsula
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Hudson Bay
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Quebec — Ungava Peninsula
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Hudson Bay
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | 
| Quebec — Ungava Peninsula Nunavut — from , Frazier Island
|-valign="top"
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Hudson Bay
| style="background:#b0e0e6;" | Passing through the Salikuit Islands (at )
|-valign="top"
| 
! scope="row" | 
| Quebec Ontario — from 
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Lake Ontario
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | 
| New York Pennsylvania — from  Maryland — from  West Virginia — from  Virginia — from  North Carolina — from  (passing just west of Wilmington at 34°14'N)
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Atlantic Ocean
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Island of Grand Bahama
|-valign="top"
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Atlantic Ocean
| style="background:#b0e0e6;" | Passing just west of the Berry Islands,  (at )
|-
| 
! scope="row" | 
| Island of Andros
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Atlantic Ocean
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
| Cayo Romano and the mainland
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Caribbean Sea
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Caribbean Sea
| style="background:#b0e0e6;" |
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Pacific Ocean
| style="background:#b0e0e6;" | Passing just east of Gorgona island,  (at )
|-
| 
! scope="row" | 
|
|-
| 
! scope="row" | 
|
|-
| 
! scope="row" | 
|
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Pacific Ocean
| style="background:#b0e0e6;" |
|-
| style="background:#b0e0e6;" | 
! scope="row" style="background:#b0e0e6;" | Southern Ocean
| style="background:#b0e0e6;" |
|-valign="top"
| 
! scope="row" | Antarctica
| Territory claimed by  (Antártica Chilena Province) and by the  (British Antarctic Territory)
|-
|}

See also
77th meridian west
79th meridian west

w078 meridian west