North - South; up and down most maps.
North and South
Longitude lines run from pole to pole.
Lines of latitude run east-west, parallel to the equator, while lines of longitude run north-south, meeting at the poles. Together, they create a grid system used to locate positions on the Earth's surface.
Longitude
Yes. Longitude lines on a map are vertical and latitude lines are horizontal. But it could be the other way around too. It depends on how you hold your map.
At the poles, the idea of longitude is essentially meaningless. Take a few steps either way; your longitude will depend on which way you walked. Of course, from the pole itself every direction is "South", which makes navigation a little challenging.....
vertically
Lines of Longitude
longitude is the long way...or horizontal. latitude is vertical, or up and down.
Lines of latitude run round the earth parallel to the Equator. Lines of longitude run from pole to pole, crossing the Equator at 90 degrees.
Lines of longitude run North-South.
Lines of Longitude are imaginary lines that run from the North Pole to the South Pole. The main line of longitude, the Prime Meridian (zero longitude), passes through the Greenwich Observatory, London, England.