Lagos alone has more people than most European countries, and somehow the whole thing just sort of works.
Fun fact: Nigeria's Nollywood produces around 2,500 films a year, outpacing Hollywood by volume.
Skipped the whole tallest-building arms race the rest of the Gulf got into, and fair play to them.
Fun fact: Oman's Majlis al Jinn cave chamber is large enough to fit several Boeing 747s inside.