Big cities are usually near waterways to make easier to trade. They are also located near key resources.
People live where they do because they were near water and in good places for farming, also in warmer climates.
There is more electricity
People live by water near warm or cool areas, but will not live in a dessert because of its heat and lack of water; and it could be related to trade and jobs
People live near water because it allows trade, travel, and farming because of the good soil.
People live near water because it allows you to have good travel and farm well because the soil there is fertile.
They live near water
People live where they do either because of the land or the weather
Different Differentiates have different populations because of the weather or the government or other things