a former mangrove swamp in Mumbai. It is one of the most densely populated places on the globe. In 2011, there were at least four improvised settlements in Mumbai containing even more people. There are in total 3.4 million people living in the 5,000 informal settlements of Bangladesh's capital city Dhaka. Thailand has 5,500 informal settlements, one of the largest being a shanty town in the Khlong Toei District of Bangkok. In China, 171 urban villages were demolished before the 2008 Summer Olympics in Beijing. As of 2005, there were 346 shanty towns in Beijing, housing 1.5 million people. Author Robert Neuwirth wrote that around six million people, half the population of Istanbul lived in gecekondu areas. In Hong Kong, the Kowloon Walled City housed up to 50,000 people, with rooftop slums currently providing some additional housing. Latin America The world's largest shanty town is Ciudad Neza or Neza-Chalco-Itza, which is part of the city of Ciudad Nezahualcóyotl, next to Mexico City. Estimates of its population range from 1.2 million to 4 million. Brazil has many favelas. In Rio de Janeiro, Brazil, it was calculated in 2000 that over 20% of its 6.5 million inhabitants were living in more than 600 favelas. For example, Rocinha is home to an estimated 80,000 inhabitants. It has developed into a densely populated neighbourhood with some buildings reaching six storeys high. There are theatres, schools, nurseries and local newspapers. In Argentina, shanty towns are known as villas miseria. As of 2011, there were 500,000 people living in 864 informal settlements in the metropolitan Buenos Aires area. In Peru they are known as pueblos jóvenes ("young towns"), as campamentos in Chile and as asentamientos in Guatemala. Developed countries During the 1930s Great Depression, shanty towns nicknamed Hoovervilles sprang up across the United States. Following the Great Depression, squatters lived in shacks on landfill sites beside the Martin Pena canal in Puerto Rico and were still there in 2010. More recently, cities such as Newark and Oakland have witnessed the creation of tent cities. The Umoja Village shanty town was squatted in 2006 in Miami, Florida. There are also colonias near the border with Mexico. Although shanty towns are now generally less common in developed countries in Europe, they still exist. The growing influx of migrants has fuelled shantytowns in cities commonly used as a point of entry into the European Union, including Athens and Patras