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The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian with which it forms a great circle. 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 Russia and Fiji as well as Antarctica.
|Country, territory or sea||Notes|
|Russia||Chukotka Autonomous Okrug|
|Amchitka Pass||Passing just east of Semisopochnoi Island, Alaska, United States (at )|
|Pacific Ocean||Passing just east of Nukulaelae atoll, Tuvalu (at )|
Passing just west of the island of Cikobia, Fiji (at )
|Fiji||Islands of Vanua Levu, Rabi, and Taveuni|
|Pacific Ocean||Passing just east of the island of Moala, Fiji (at )|
Passing just west of the island of Totoya, Fiji (at )
Passing just east of the island of Matuku, Fiji (at )
|Antarctica||Ross Dependency, claimed by New Zealand|
The meridian also passes between (but not particularly close to):
The only place where roads cross this meridian, and where there are buildings very close to it, is in Fiji.