The answer is Mesopotamia. Hope I could help :)
High density of people in Hong Kong, New york City, all big citys in India like Delhi or calcuta
In 1885 European leaders met at the infamous Berlin Conference to divide Africa and arbitrarily draw up borders that exist to this day. Lines of longitude and latitude, rivers and mountain ranges were pressed into service as borders separating the colonies.
Mostly are formed(or carved by water or erosion) side of sea cliffs, Yosemite national park, some of California's lakes,
