Los grandes ríos

El río Nilo

http://maps.google.com/maps?ll=30.166667,31.1&spn=0.1,0.1&t=h&q=30.166667,31.1

el Tigris y el Éufrates

http://maps.google.com/maps?ll=31.015833,47.430556&spn=0.1,0.1&t=h&q=31.015833,47.430556