The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian passing through the Royal Observatory, Greenwich. It is common to both east longitude and west longitude. It is used as the basis for the International Date Line because it for the most part passes through the open waters of the Pacific Ocean. However, the meridian passes through a few countries as well as Antarctica.
Starting at the North Pole and heading south to the South Pole, the 180th meridian passes through:
| Co-ordinates (approximate) |
Country, territory or sea | Notes |
|---|---|---|
| 90°0′N 180°0′E / 90°N 180°E | Arctic Ocean | |
| 71°32′N 180°0′E / 71.533°N 180°E |  Russia |
Wrangel Island |
| 70°58′N 180°0′E / 70.967°N 180°E | Chukchi Sea | |
| 68°59′N 180°0′E / 68.983°N 180°E | Russia |
Chukotka Autonomous Okrug |
| 65°02′N 180°0′E / 65.033°N 180°E | Bering Sea | |
| 52°0′N 180°0′E / 52°N 180°E | Amchitka Pass | Passing just east of Semisopochnoi Island, Alaska,  United States |
| 51°0′N 180°0′E / 51°N 180°E | Pacific Ocean | Passing just east of Nukulaelae atoll,  Tuvalu at 9°23′S 180°0′E / 9.383°S
180°E |
| 16°9′S 180°0′E / 16.15°S 180°E |  Fiji |
Islands of Vanua Levu, Rabi, and Taveuni |
| 16°59′S 180°0′E / 16.983°S 180°E | Pacific Ocean | Passing just east of the island of
Moala, Fiji Passing just west of the island of Totoya, FijiPassing just east of the island of Matuku, Fiji |
| 60°0′S 180°0′E / 60°S 180°E | Southern Ocean | |
| 78°13′S 180°0′E / 78.217°S 180°E | Antarctica | Ross
Dependency, claimed by  New Zealand |
The meridian also passes between (but not particularly close to):
Kiribati; New Zealand; New Zealand.
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