10th meridian west
The meridian 10° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, the Atlantic Ocean, Ireland, Africa, the Southern Ocean, and Antarctica to the South Pole.
The 10th meridian west forms a great circle with the 170th meridian east.
This longitude is the eastern limit of the Atlântico Brasileiro, Montevideo, Ezeiza and Comodoro Rivadavia flight information regions, as well as the western limit of the Luanda and Johannesburg Oceanic FIRs.
The meridian defines the western limit of the New Swabia area in Queen Maud Land, Antarctica.