The meridian 91° 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 91st meridian east forms a great circle with the 89th meridian west.
Starting at the North Pole and heading south to the South Pole, the 91st meridian east passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| Arctic Ocean | ||
| Krasnoyarsk Krai — Schmidt Island, Severnaya Zemlya | ||
| Kara Sea | Passing just west of Pioneer Island, Severnaya Zemlya, Krasnoyarsk Krai, | |
| Krasnoyarsk Krai — Sedov Archipelago, Severnaya Zemlya | ||
| Kara Sea | Passing just east of the Kirov Islands, Krasnoyarsk Krai, | |
| Krasnoyarsk Krai Republic of Khakassia — from Krasnoyarsk Krai — from Tuva Republic — from | ||
| Xinjiang | ||
| Xinjiang - for about 16km (10miles) | ||
| Xinjiang Qinghai — from Xinjiang — from Qinghai — from Xinjiang — from Qinghai — from Tibet — from, passing just west of Lhasa (at) | ||
| Assam Meghalaya — from | ||
| Mainland and islands in the Ganges Delta | ||
| Indian Ocean | ||
| Southern Ocean | ||
| Antarctica | Australian Antarctic Territory, claimed by | |