Main article: Cell membrane. The cell membrane, or plasma membrane, is a biological membrane that surrounds the cytoplasm of a cell. In animals, the plasma membrane is the outer boundary of the cell, while in plants and prokaryotes it is usually covered by a cell wall.
Egypt lies between the Red Sea to the east and the Mediterranean Sea to the north. The Red Sea is a narrow, landlocked sea that separates Africa from the Arabian Peninsula. It links to the Mediterranean through the Gulf of Suez and the Suez Canal.
Moving up in size, a sea is a large body of water that is surrounded by land or attached to another body of water. The Caspian Sea is one that is surrounded by land. The Mediterranean Sea is one that is attached to another body of water, in this case the Atlantic Ocean.