The Seibu Shinjuku Line is a railway line operated by Seibu Railway in Japan. It connects Seibu Shinjuku Station in Tokyo to Hon-Kawagoe Station in Saitama Prefecture, covering a distance of approximately 25 kilometers. The line primarily serves commuters traveling between the city and suburban areas. The Seibu Shinjuku Line features both local and express trains, providing convenient access to various neighborhoods and attractions. It is known for its efficient service and connections to other lines, making it a popular choice for daily travelers and tourists exploring the region.