The meridian 90° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole.
The Ninety East Ridge is named after the meridian.
The 90th meridian east forms a great circle with the 90th meridian west.
Starting at the North Pole and heading south to the South Pole, the 90th meridian east passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Kara Sea | Passing just west of Schmidt Island, Russia | |
| Russia | Kirov Islands | |
| Kara Sea | ||
| Russia | ||
| Mongolia | Bayan-Ölgii Province | |
| People's Republic of China | Xinjiang Qinghai Tibet |
|
| Bhutan | ||
| India | West Bengal Assam Meghalaya |
|
| Bangladesh | ||
| Indian Ocean | ||
| Southern Ocean | ||
| Antarctica | Australian Antarctic Territory, claimed by Australia |
|
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