PATH is a network of underground pedestrian tunnels, elevated walkways, and at-grade walkways connecting the office towers of Downtown Toronto, Ontario, Canada.
It connects more than 30 kilometres (19 mi) of tunnels, walkways, and shopping areas. PATH is the largest underground shopping complex in the world with 371,600 square metres (4,000,000 sq ft) of retail space.
The PATH network's northerly point is the Toronto Coach Terminal at Dundas Street and Bay Street, while its southerly point is Waterpark Place on Queens Quay. Its main north-south axes of walkways generally parallel Yonge and Bay Streets, while its main east-west axis parallels King Street.
According to en.wikipedia