We all know these cities have giant populations, but do you know just how crowded they are? The United Nations data booklet, “The World’s Cities in 2016,” details the world’s most populated cities as well as population growth projections for 2030.

Tokyo, Japan, for example, is the most populated city in the world as of 2016 with nearly 39 million residents. Keep reading for the rest of the top 20 most populated cities all over the globe.