The Tokyo Metro Marunouchi Line is a major subway line in Tokyo, Japan, operated by the Tokyo Metro company. It runs from Ikebukuro in the north to Shinjuku in the south, covering a distance of approximately 27.1 kilometers. The line is known for its distinctive red color and connects several key areas, making it a vital transportation route for commuters and tourists alike. Opened in 1954, the Marunouchi Line has 28 stations, including important stops like Tokyo Station and Shinjuku Station. It serves both business districts and popular shopping areas, facilitating easy access to attractions such as Tokyo Disneyland and the Imperial Palace. The line is also known for its efficient service and frequent trains.