Africa, satellite:

Sahara regions: http://en.wikipedia.org/wiki/File:Saharan_topographic_elements_map.png

Siwa: http://safari-adventures.org/siwa_oasis.htm

Siwa, shali: http://en.wikipedia.org/wiki/File:Siwaoasis.JPG

Egypt, satellite: http://familypedia.wikia.com/wiki/Egypt

Siwa, ruins (oracle temple): http://www.heatheronhertravels.com/my-vacation-iphone-app-review/

Siwa: http://en.wikipedia.org/wiki/File:Oase_Siwa.jpg

Siwa, ruins (temple of Amun): http://en.wikipedia.org/wiki/File:Amun_2010.jpg

View south of Siwa (Great Sea of Sand): http://en.wikipedia.org/wiki/File:Siwa_sand_dunes2009a.jpg

Siwa Lake: http://en.wikipedia.org/wiki/File:Siwa_Oasis2009b.jpg

Siwa, panorama: http://upload.wikimedia.org/wikipedia/commons/a/ac/Pano_Siwa_depuis_Dakrur-Battesti.jpg

Siwa, mud brick houses (mosque): http://en.wikipedia.org/wiki/File:Mosque_in_Siwa_Oasis_%282007%29.jpg

Siwa, map: http://www.envegypt.com/siwa/Venue.asp

Siwa oasis, salt lake: http://amanyamasr2011.com/TP2.html

Qattara Depression: http://zarzora.com/gallery/main.php?g2_itemId=708

Grea Sand Sea: http://allegypthotelsguide.com/western_desert_egypt.html

Egypt: http://www.nae.edu/Publications/Bridge/V38N2/RemoteSensingoftheEarthImplicationsforGroundwaterinDarfur.aspx

Radar Ancient rivers in Egypt: http://www.abovetopsecret.com/forum/thread101403/pg1

Egypt topography: http://en.wikipedia.org/wiki/File:Egypt_Topography.png

Radar image of stream channels: http://en.wikipedia.org/wiki/File:SafsafOasis_SAR_comparison.jpg

Tuareg rider: http://en.wikipedia.org/wiki/File:Hoggar_caravane2.jpg

Sahara: http://en.wikipedia.org/wiki/File:Africa_satellite_orthographic.jpg

Sahara, volcano (Emi Koussi, Chad): http://en.wikipedia.org/wiki/File:Emi_Koussi-Tibesti_Mountains-Chad.jpg

Sahara, Air mountains: http://en.wikipedia.org/wiki/File:Timia_valley.JPG

Tenere desert: http://en.wikipedia.org/wiki/File:Arakao1.jpg

Richat Structure: http://www.loc.gov/exhibits/earthasart/eaa-exhibit.html?CFID=44867812&CFTOKEN=83532949

Artesian System

Chebika oasis (Tunisia): http://www.bestourism.com/items/di/219?title=Chebika-Oasis-in-Tunisia&b=33

Huachina oasis (Peru): http://www.nazcalines.info/tours/travel_deals/ica_nasca_lines.html

Ubari oasis (Libya): http://www.worldinfomatic.com/web/2010/06/04/most-fascinating-oases-of-the-world/

Timea Oasis (Niger): http://www.oddee.com/item_92692.aspx