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The 180th meridian or antimeridian is the meridian defined as 180° longitude. It is the line of longitude exactly opposite the Prime Meridian. 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:
| Country, territory or sea | Notes |
|---|---|
| Arctic Ocean | |
 Russia |
Wrangel Island |
| Chukchi Sea | |
| Russia |
Chukotka Autonomous Okrug |
| Bering Sea | |
| Amchitka Pass | Passing between Semisopochnoi Island and Amatignak Island, Alaska,  United States |
| Pacific Ocean | Passing just east of Nukulaelae atoll,  Tuvalu |
 Fiji |
Islands of Vanua Levu, Rabi, and Taveuni |
| Pacific Ocean | |
| Southern Ocean | |
| Antarctica | Ross Dependency, claimed by  New Zealand |
The meridian also passes between (but particularly close to) the Gilbert Islands and the Phoenix Islands islands of 
Kiribati; between North Island and the Kermadec Islands of New Zealand; and between the Bounty Islands and the Chatham Islands, also of New Zealand.