The London Underground is the world's oldest subway system. It is also known by the names The Tube and The Underground.

Nowadays, the London Underground is used to complete over one billion journeys every year. There are almost three hundred stations in the London subway system.

Can you read a subway map? Study the map of the London Underground at http://www.tubemaplondon.org/.

a) You arrive by plane at Heathrow Airport. It is found in the southwest corner of the map.
b) Your destination is the London Zoo in Regent's Park.
c) What is your route from Heathrow to Regent's Park? What route do you use? Where you will change between different lines?