The nile river

1.is surrounded by farmland
2.was once the homeland of ancient civilizations
3. provides irrigation for surrounding farms
4. runs through western sahara and morocco
5. floods annually

The Nile River floods annually.  

Every year, flooding is a notable feature for the Nile, as it gives fertilized soil to farmers who live near the river.

So, out of all the options listed, the best option is number 5.

Asmall closed hole formed in an outwash plain or moraine. forms when a  glacier retreats then remains stationary. 

Ithink is a i believe