The Northern line is a major line of the London Underground, serving the city of London, England. It runs from Morden in the south to High Barnet and Mill Hill East in the north, covering a distance of approximately 58 kilometers. The line is known for its distinctive black color on the Tube map and has 50 stations, making it one of the busiest lines in the network. The Northern line is divided into two branches: the City branch and the West End branch. It connects key areas such as Clapham, Camden, and King's Cross, providing essential transport for commuters and tourists alike. The line also features both deep-level and surface sections, enhancing its accessibility across different parts of the city.