Why did the south rely on rivers for transportation during the civil war?

The South relied on rivers for the transportation during the civil war because the South did not have as many railroads as the North.

The American Civil War was a fight in the United States spanned from 1861 to 1865, between the North and the South. During this armed conflict railroads, the telegraph, steam and iron ships, and mass-produced weapons were massively implemented. But the South did not count on those innovations as the North did.

whats the question? im not quite understanding your question.