<P> The London Underground is a metro system in the United Kingdom that serves Greater London and the neighbouring counties of Essex, Hertfordshire and Buckinghamshire . Its first section opened in 1863 . </P> <P> The system has 270 stations . In 2017, King's Cross St. Pancras was the busiest station on the network, used by over 97 million passengers, while Roding Valley was the quietest, with 368,413 passengers . </P> <P> This table lists the stations with 33.5 million users or more entering or exiting in 2017 . The total of annual entries and exits for all stations in 2017 was 2.946 billion . </P>

What is the busiest station on the london underground