The meridian 51° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Europe, Asia, Africa, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole. The 51st meridian east forms a great circle with the 129th meridian west.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 51st meridian east passes through: ! scope="col" width="115" | Co-ordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Barents Sea ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Barents Sea ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Barents Sea ! scope="row" | 🇷🇺 ! scope="row" | 🇰🇿 ! scope="row" style="background:#b0e0e6;" | Caspian Sea ! scope="row" | 🇰🇿 ! scope="row" style="background:#b0e0e6;" | Caspian Sea ! scope="row" | 🇰🇿 ! scope="row" style="background:#b0e0e6;" | Caspian Sea ! scope="row" | 🇮🇷 ! scope="row" style="background:#b0e0e6;" | Persian Gulf ! scope="row" | 🇶🇦 ! scope="row" | 🇸🇦 ! scope="row" | 🇾🇪 ! scope="row" style="background:#b0e0e6;" | Indian Ocean ! scope="row" | 🇸🇴 ! scope="row" style="background:#b0e0e6;" | Indian Ocean ! scope="row" | 🇸🇨 ! scope="row" style="background:#b0e0e6;" | Indian Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica