Nigeria is located between longitudes 3°E and 15°E. Longitude is a measure of distance east or west of the Prime Meridian, which is an imaginary line that runs from the North Pole to the South Pole and passes through the Royal Observatory in Greenwich, London. The Prime Meridian has a longitude of 0°, and all other longitudes are measured in degrees east or west of the Prime Meridian.
Nigeria is located in West Africa, and its easternmost point is about 3°E, while its westernmost point is about 15°E. Therefore, Nigeria is located between longitudes 3°E and 15°E.