The sand sea that composes a large part of the Namib Desert in South West Africa covers approximately 34,000 km2 and extends from the Great Escarpment on the east to the Atlantic Ocean on the west, south of the Kuiseb River. This sand sea, or erg, contains most of the principal dune types that have been recognized throughout the world, many of them of great height and separated by broad, flat interdunes. The dominant type and by far the most common form is the linear (seif, longitudinal) dune that extends as a series of long, nearly parallel ridges with north-south orientation across the length of the dune field. Keywords: Namibia, Namib Desert, Kuiseb River, aeolian deposits, sand dunes, dune morphology, dune types, dune age, geomorphology, dune formation, dune movement, sand flow, sand composition, sand deposit, wind.