Tokyo, Japan - October 4, 2012: Businessman among other people walking in Shinjuku in Tokyo. Shinjuku is one of the 23 special wards of the city. It is one of the major business and administrative parts of the capital. The government of the city is located here as well as many big world corporations that have their offices in this area. It has an extension of 18 square kilometers and a population of more than 300000 thousand people living here and many more coming to work every day. It is also known for having the busiest train station in the world.