The Toei Shinjuku Line is a subway line in Tokyo, Japan, operated by the Tokyo Metropolitan Bureau of Transportation. It runs from Shinjuku Station in the west to Mitsuke Station in the east, covering a distance of approximately 27.4 kilometers. The line features 24 stations and connects with several other major lines, making it a vital part of Tokyo's public transportation network. Opened in 1978, the Toei Shinjuku Line is known for its efficient service and modern trains. It primarily serves the Shinjuku and Shibuya areas, providing easy access to shopping, dining, and entertainment. The line is also notable for its underground sections, which help reduce surface congestion in the bustling city.