Sao Paulo is the largest city in Brazil, with a city population of about 11 million and almost 20 million in its metropolitan region. It is the capital of the Southeastern state of Sao Paulo, and also a beehive of activity that offers a jovial nightlife and an intense cultural experience. Sao Paulo is one of the richest cities in the southern hemisphere, though inequality between the classes typically observed in Brazil is blatant. Historically attractive to immigrants as well as (somewhat later) Brazilians from other states, it's one of the most diverse cities in the world.