The imaginary lines on a map that divide the world are called:

* Lines of Longitude: These lines run north-south from pole to pole and are also known as meridians. They are measured in degrees east or west of the Prime Meridian (0 degrees longitude).

* Lines of Latitude: These lines run east-west parallel to the equator and are also known as parallels. They are measured in degrees north or south of the equator (0 degrees latitude).

Let me know if you would like to know more about either of these lines!