Density: 41,014 persons per square kilometer.
The capital of the Philippines, Manila boasts the highest population density in the world, with its sixth district the densest. It is poised between Manila Bay and Laguna Bay and has been a major port for centuries. The metropolitan area consists of some 10 million people. The roads are filled with buses, pedicabs (bicycles with sidecars) and cars. The traffic is consistently described as horrendous. Fixing this situation has to be put into the context of serious water problem and other infrastructure calamities.