How could a river be both a valuable resource and a problem for a region?

A river could be a valuable resource as drinking water for a nearby group of people. A river could also be a problem for a group of people that need to cross the river but have no way to cross it.

A river can be considered to be a natural resource because it provides fresh water for drinking. In addition to this, a large number of people are dependent on them as it is a major source for fishing, irrigation purpose, industries and factories.

Rivers can also turn out to be a problem for a particular region. It is because, during the time of heavy rainfall, the water level in the river rises up, as a result of which it overflows in the inland areas, thereby causes flood, affecting lives, properties, and agricultural crop fields.

the mediterranean sea

polar areas, such as antarctica or the south pole.