A definite line was drawn between the two continents by the geographer Ptolemy (85–165 AD), indicating Alexandria along the Prime Meridian and making the isthmus of Suez and the Red Sea the boundary between Asia and Africa.
Unha liña definitoria foi trazada entre os dous continente polo xeógrafo Tolomeo (85–165), indicando Alexandría no primeiro meridiano e convertendo o istmo de Suez e o mar Vermello como a fronteira entre Asia e África.