Meridian barat ke-66
Dari ujung ke ujung

Berawal di Kutub Utara menuju selatan di Kutub Selatan, meridian barat ke-66 melintasi:
| Koordinat | Negara, teritori, atau laut | Catatan |
| --- | --- | --- |
| 90°0′N 66°0′W﻿ / ﻿90.000°N 66.000°W﻿ / 90.000; -66.000﻿ (Arctic Ocean) | Samudra Arktik |  |
| 83°15′N 66°0′W﻿ / ﻿83.250°N 66.000°W﻿ / 83.250; -66.000﻿ (Lincoln Sea) | Laut Lincoln |  |
| 82°50′N 66°0′W﻿ / ﻿82.833°N 66.000°W﻿ / 82.833; -66.000﻿ (Canada) |  Kanada | Nunavut — Pulau Ellesmere |
| 81°13′N 66°0′W﻿ / ﻿81.217°N 66.000°W﻿ / 81.217; -66.000﻿ (Nares Strait) | Selat Nares |  |
| 80°37′N 66°0′W﻿ / ﻿80.617°N 66.000°W﻿ / 80.617; -66.000﻿ (Greenland) |  Greenland |  |
| 80°0′N 66°0′W﻿ / ﻿80.000°N 66.000°W﻿ / 80.000; -66.000﻿ (Nares Strait) | Selat Nares | Cekungan Kane |
| 79°8′N 66°0′W﻿ / ﻿79.133°N 66.000°W﻿ / 79.133; -66.000﻿ (Greenland) |  Greenland |  |
| 76°2′N 66°0′W﻿ / ﻿76.033°N 66.000°W﻿ / 76.033; -66.000﻿ (Baffin Bay) | Teluk Baffin |  |
| 70°0′N 66°0′W﻿ / ﻿70.000°N 66.000°W﻿ / 70.000; -66.000﻿ (Davis Strait) | Selat Davis |  |
| 68°1′N 66°0′W﻿ / ﻿68.017°N 66.000°W﻿ / 68.017; -66.000﻿ (Canada) |  Kanada | Nunavut — Semenanjung Cumberland, Pulau Baffin |
| 66°6′N 66°0′W﻿ / ﻿66.100°N 66.000°W﻿ / 66.100; -66.000﻿ (Davis Strait) | Selat Davis | Teluk Cumberland |
| 64°50′N 66°0′W﻿ / ﻿64.833°N 66.000°W﻿ / 64.833; -66.000﻿ (Canada) |  Kanada | Nunavut — Semenanjung Hall, Pulau Baffin |
| 62°57′N 66°0′W﻿ / ﻿62.950°N 66.000°W﻿ / 62.950; -66.000﻿ (Frobisher Bay) | Teluk Frobisher |  |
| 62°15′N 66°0′W﻿ / ﻿62.250°N 66.000°W﻿ / 62.250; -66.000﻿ (Canada) |  Kanada | Nunavut — Semenanjung Meta Incognita, Pulau Baffin |
| 61°52′N 66°0′W﻿ / ﻿61.867°N 66.000°W﻿ / 61.867; -66.000﻿ (Hudson Strait) | Selat Hudson |  |
| 60°30′N 66°0′W﻿ / ﻿60.500°N 66.000°W﻿ / 60.500; -66.000﻿ (Ungava Bay) | Teluk Ungava |  |
| 58°58′N 66°0′W﻿ / ﻿58.967°N 66.000°W﻿ / 58.967; -66.000﻿ (Canada) |  Kanada | Quebec  Newfoundland dan Labrador — Labrador, dari 54°56′N 66°0′W﻿ / ﻿54.933°N 66.000°W﻿ / 54.933; -66.000﻿ (Newfoundland dan Labrador)  Quebec — dari 52°4′N 66°0′W﻿ / ﻿52.067°N 66.000°W﻿ / 52.067; -66.000﻿ (Quebec) |
| 50°16′N 66°0′W﻿ / ﻿50.267°N 66.000°W﻿ / 50.267; -66.000﻿ (Gulf of Saint Lawrence) | Teluk Saint Lawrence |  |
| 49°13′N 66°0′W﻿ / ﻿49.217°N 66.000°W﻿ / 49.217; -66.000﻿ (Canada) |  Kanada | Quebec — Semenanjung Gaspé |
| 48°9′N 66°0′W﻿ / ﻿48.150°N 66.000°W﻿ / 48.150; -66.000﻿ (Chaleur Bay) | Teluk Chaleur |  |
| 47°55′N 66°0′W﻿ / ﻿47.917°N 66.000°W﻿ / 47.917; -66.000﻿ (Canada) |  Kanada | New Brunswick |
| 45°13′N 66°0′W﻿ / ﻿45.217°N 66.000°W﻿ / 45.217; -66.000﻿ (Bay of Fundy) | Teluk Fundy |  |
| 44°35′N 66°0′W﻿ / ﻿44.583°N 66.000°W﻿ / 44.583; -66.000﻿ (Canada) |  Kanada | Nova Scotia |
| 43°43′N 66°0′W﻿ / ﻿43.717°N 66.000°W﻿ / 43.717; -66.000﻿ (Atlantic Ocean) | Samudra Atlantik |  |
| 18°27′N 66°0′W﻿ / ﻿18.450°N 66.000°W﻿ / 18.450; -66.000﻿ (Puerto Rico) |  Puerto Riko |  |
| 17°58′N 66°0′W﻿ / ﻿17.967°N 66.000°W﻿ / 17.967; -66.000﻿ (Caribbean Sea) | Laut Karibia | Sebelah timur pulau La Orchila,  Venezuela (di 11°52′N 66°5′W﻿ / ﻿11.867°N 66.083°W﻿ / 11.867; -66.083﻿ (La Orchila)) |
| 10°24′N 66°0′W﻿ / ﻿10.400°N 66.000°W﻿ / 10.400; -66.000﻿ (Venezuela) |  Venezuela |  |
| 0°48′N 66°0′W﻿ / ﻿0.800°N 66.000°W﻿ / 0.800; -66.000﻿ (Brazil) |  Brasil | Amazonas  Rondônia — dari 9°24′S 66°0′W﻿ / ﻿9.400°S 66.000°W﻿ / -9.400; -66.000﻿ (Rondônia) |
| 9°48′S 66°0′W﻿ / ﻿9.800°S 66.000°W﻿ / -9.800; -66.000﻿ (Bolivia) |  Bolivia |  |
| 21°55′S 66°0′W﻿ / ﻿21.917°S 66.000°W﻿ / -21.917; -66.000﻿ (Argentina) |  Argentina |  |
| 45°0′S 66°0′W﻿ / ﻿45.000°S 66.000°W﻿ / -45.000; -66.000﻿ (Atlantic Ocean) | Samudra Atlantik | Teluk San Jorge |
| 47°5′S 66°0′W﻿ / ﻿47.083°S 66.000°W﻿ / -47.083; -66.000﻿ (Argentina) |  Argentina |  |
| 48°6′S 66°0′W﻿ / ﻿48.100°S 66.000°W﻿ / -48.100; -66.000﻿ (Atlantic Ocean) | Samudra Atlantik |  |
| 54°37′S 66°0′W﻿ / ﻿54.617°S 66.000°W﻿ / -54.617; -66.000﻿ (Argentina) |  Argentina | Isla Grande de Tierra del Fuego |
| 54°57′S 66°0′W﻿ / ﻿54.950°S 66.000°W﻿ / -54.950; -66.000﻿ (Atlantic Ocean) | Samudra Atlantik |  |
| 60°0′S 66°0′W﻿ / ﻿60.000°S 66.000°W﻿ / -60.000; -66.000﻿ (Southern Ocean) | Samudra Selatan |  |
| 65°33′S 66°0′W﻿ / ﻿65.550°S 66.000°W﻿ / -65.550; -66.000﻿ (Antarctica) | Antarktika | Pulau Renaud — Teritori diklaim oleh  Argentina,  Chili dan  Britania Raya |
| 65°54′S 66°0′W﻿ / ﻿65.900°S 66.000°W﻿ / -65.900; -66.000﻿ (Southern Ocean) | Samudra Selatan |  |
| 66°39′S 66°0′W﻿ / ﻿66.650°S 66.000°W﻿ / -66.650; -66.000﻿ (Antarctica) | Antarktika | Teritori diklaim oleh  Argentina,  Chili dan  Britania Raya |