It is important to these countries because it provides them with resources for food,transportation, trade and religion
Food: the Nile provides fertile land for agriculture and plantation, also the inhabitants can feed off the animals in the river
Transportation: due to its immense length, people can transport through water across the river to reach certain destinations.
Trade: due to the facility of transportation people can move from one place to another and trade goods.
Religion: for example the people of Egypt held the river as a god and praise it for all the good it brought to them.
