The freshwater supply in Civilization 7 is a very important thing in the game. It is very troublesome to not provide freshwater in the settlement near the settlement, and having freshwater (cyan plots) will provide a permanent +5 happiness bonus for the settlement. . Another thing to note is that there is a big difference between whether the river is navigable.
Civilization 7 What should be paid attention to when providing fresh water
Settlements offer very troublesome without freshwater, and having freshwater (cyan plots) will provide a permanent +5 happiness bonus to the settlement.
One thing to note is that navigable rivers provide fresh water to adjacent plots, while non-navigable rivers provide fresh water only when they settle. Some other plots, such as oasis, also provide fresh water.