North Africa is a relatively thin strip of land between the Sahara desert and the Mediterranean, stretching from Moroccan Atlantic coast to Egypt. The region has no set definition, and varies from source to source. Generally included are, from west to east, Morocco, Algeria, Tunisia, Libya and Egypt. The region has been influenced by many diverse cultures. The development of sea travel firmly brought the region into the Mediterranean world, especially during the classical period. In the 1st millennium AD, the Sahara became an equally important area for trade as camel caravans brought goods and people from the south. The region also has a small but crucial land link to the Middle East, and that area has also played a key role in the history of North Africa.