The meridian 70° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Atlantic Ocean, the Caribbean Sea, South America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 70th meridian west forms a great circle with the 110th meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 70th meridian west passes through: ! scope="col" width="120" | Co-ordinates ! scope="col" width="150" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Nares Strait ! scope="row" | 🇬🇱 ! scope="row" style="background:#b0e0e6;" | Baffin Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Hudson Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Hudson Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Diana Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Saint Lawrence River ! scope="row" | 🇨🇦 ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇺🇸 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇩🇴 ! scope="row" style="background:#b0e0e6;" | Caribbean Sea ! scope="row" | 🇦🇼 ! scope="row" style="background:#b0e0e6;" | Caribbean Sea ! scope="row" | 🇻🇪 ! scope="row" | 🇨🇴 ! scope="row" | 🇧🇷 ! scope="row" | 🇨🇴 ! scope="row" | 🇵🇪 ! scope="row" | 🇧🇷 ! scope="row" | 🇵🇪 ! scope="row" | ! scope="row" | 🇦🇷 ! scope="row" | ! scope="row" | 🇦🇷 ! scope="row" | ! scope="row" | 🇦🇷 ! scope="row" | ! scope="row" | 🇦🇷 ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Straits of Magellan ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica