The Boston Globe weblog the Big Picture has an online series (23 photos) of fantastic images from NASA’s Earth Observatory site itself. Below are two smaller versions of the images:
#3 South of Khartoum, Sudan, where the White and Blue Nile Rivers join, a dizzying arrangement of irrigated fields stretches out across the state of El Gezira. The several bare-looking patches are small villages. This image was captured by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite on December 25, 2006. (NASA/GSFC/METI/ERSDAC/JAROS, U.S./Japan ASTER Science Team)
#6 Sidi Toui National Park, in the southern half of Tunisia, close to the Libyan border, viewed by the Enhanced Thematic Mapper Plus (ETM+) instrument on NASA's Landsat 7 satellite on December 13, 1999. Native vegetation can be seen returning inside the borders of this protected park (approx. 7 kilometers wide), established in 1993 to protect the region against desertification. The effects of continued agriculture, overgrazing and drought can be seen on the surrounding arid landscape. (NASA/Jesse Allen/Landsat,USGS)