What Happened To The Land Because Rivers Like The Nile Tigris And Euphrates Flooded In Ancient Times?

What Happened To The Land Because Rivers Like The Nile Tigris And Euphrates Flooded In Ancient Times? Because rivers like the Nile, Tigris, and Euphrates flooded in ancient times… Land around the river was fertile and capable of supporting farming. What was an advantage that merchants traveling on the Nile river had over the rivers