Shinjuku

Shinjuku Station is a major railway station in Tokyo, Japan, that serves as the main connecting hub for rail traffic between central/eastern Tokyo and Western Tokyo on the inter-city rail, commuter rail, and subway lines. The station straddles the boundary between the Shinjuku and Shibuya special wards. In Shinjuku, it is in the Nishi-Shinjuku and Shinjuku districts; in Shibuya, it is in the Yoyogi and Sendagaya districts.

The station was used by an average of 3.59 million people per day in 2018, making it the world's busiest railway station by far. The main East Japan Railway Company station and the directly adjacent private railways have a total of 35 platforms, an underground arcade, above-ground arcade and numerous hallways with another 17 platforms that can be accessed through hallways to five directly connected stations without surfacing outside. The entire above/underground complex has well over 200 exits.

Source: Wikipedia