Great Northern line on the London Underground
Here is a map of the approximate route of the Great Northern line on the London underground along with the stations that are on the line.
Zone 1 
Zone 2 
Zone 3 
Zone 4 
Zone 5 
Zone 6Here is a map of the approximate route of the Great Northern line on the London underground along with the stations that are on the line.
Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6