Yes if the farmer uses chemical fertilisers etc on his crops these seep into the water and factory pollution would pollute the rivers.
Almost all of the ancient civilizations could be found along rivers or at least a good source of water. Water was essential for daily living and farming. The Mesopotamian civilizations were along the Euphrates and Tigres, the Egyptian civilization was along the Nile, while the Syrians had their capitol of Antioch on the Orontes River.
The Great Wall of China.
The farming area of rich land along rivers in Mesopotamia is called the Fertile Crescent. It is located between the Tigris and Euphrates Rivers.
There are the furat and dajla rivers in Iraq wich are the biggest in the area and are good for farming.
agriculture
South Asia is more rural than East Asia with more mountains and rivers. Farming is the main industry and there is lots of poverty. East Asia is populated with large cities and very urban.
Along the rivers.
Cultivation and other farming
Farming
Early people began farming in multiple locations independently across the world, including the Fertile Crescent in the Middle East, China, Mesoamerica, and the Andes. The domestication of plants and animals led to the development of agriculture in these regions.
They used them for protection and farming.
Think agriculture.