Between eastern Africa (left) and Saudi Arabia (right) a dust cloud was blowing over the Red Sea on June 18, 2003, and was captured in this image from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite. An especially dense plume of dust (tan pixels) sits about halfway up the East African coastline, which is right at the border of Sudan (north) and Eritrea (south).
Image by Jesse Allen, based on data from the MODIS Rapid Response Team at NASA GSFC