Ancient Egypt Geography - Be sure to scroll down and click on the Nile River links http://egypt.mrdonn.org/geography.html
Mysteries of Egypt - Be sure to click on the sections about the Nile River http://www.civilization.ca/cmc/exhibitions/civil/egypt/egcgeo1e.shtml
The Natural World http://www.carnegiemnh.org/exhibits/egypt/naturalworld.htm
The British Museum: Geography http://www.ancientegypt.co.uk/geography/home.html
Geography of Ancient Egypt http://www.mnsu.edu/emuseum/prehistory/egypt/dailylife/geography.html
The Nile River Flood - Be sure to scroll down to the Nile section http://www.pbs.org/wgbh/nova/flood/deluge.html