To help locate where a place is in the world, people use imaginary lines called latitude and longitude. Find out more with this year 3/4 BBC Bitesize geography guide.

Longitude lines loop the planet from north to south, starting at each pole. How does latitude work? Imagine a belt around our planet's 25,000-mile waistline, the equator.

Lines of longitude, or meridians, are drawn a little differently. The line of longitude corresponding to 0°, which passes through Greenwich in London, is called the Prime (or Greenwich) Meridian.

A series of lines crisscrosses the world's maps and globes. The 180 horizontal latitude lines, and 360 vertical lines that mark east and west longitude, are vital to navigators.

At the equator, one degree of longitude and latitude both cover about 111 kilometers, or just under 70 miles. When we get away from the equator, this starts getting tricky. Longitude lines.

The globe shows the lines of latitude and the degrees of north and south. The line labelled 0° longitude is called the Prime Meridian or the Greenwich Meridian and runs through London.