The meridian 79° 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, Panama, South America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 79th meridian west forms a great circle with the 101st meridian east.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 79th meridian west passes through: ! scope="col" width="120" | 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;" | Glacier Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Baffin Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Eclipse Sound ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Foxe Basin ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Foxe Basin ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Foxe Basin ! scope="row" style="background:#b0e0e6;" | Foxe Channel ! scope="row" style="background:#b0e0e6;" | Hudson Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Hudson Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | James Bay ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Lake Ontario ! scope="row" | 🇺🇸 ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Lake Erie ! 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" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | 🇵🇦 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | 🇨🇴 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | 🇪🇨 ! scope="row" | 🇵🇪 ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" | ! scope="row" style="background:#b0e0e6;" | Pacific Ocean ! scope="row" style="background:#b0e0e6;" | Southern Ocean ! scope="row" | Antarctica