North Africa stretches from the Atlantic Ocean to the Red Sea. The Nile River flows through Egypt and empties into the Mediterranean Sea, depositing silt that enriched farmlands. Ancient Egyptians built pyramids and developed hieroglyphics along the Nile River. The region was later invaded by Greeks and Arabs who introduced Islam. Today, North African countries face challenges of poverty, limited resources, and conflicts over the role of Islam in society, though oil exports help some economies.