Many of the World's Large Rivers Flow from One State

Short Answer

Many of the world's large rivers flow from one state or province to another, or even through several others. The Colorado River and Mississippi River are examples of this. In many instances, they flow from one country to another. Discuss the potential problems that arise from this simple geographical fact. For example, what potential problem arises if the irrigation water used in Nebraska was polluted or contaminated as the water moved through South Dakota?