between Europe and Asia (dividing Eurasia): along the Turkish Straits, the Caucasus, and the Urals and the Ural River (historically also north of the Caucasus, along the Kuma–Manych Depression or along the Don River) between Asia and Africa (dividing Afro-Eurasia into Africa and Eurasia): at the Isthmus of Suez between North America and South America (dividing the Americas): at some point on the Isthmus of Panama, with the most common demarcation in atlases and other sources following the Darién Mountains watershed that divides along the Colombia–Panama border where the isthmus meets the South American continent (see Darién Gap) While  the isthmus between Asia and Africa  and that between North and South America are today navigable, via the Suez and Panama canals, respectively, diversions and canals of human origin generally are not accepted on their own accord as continent-defining boundaries ; the Suez Canal happens to traverse the isthmus between the Mediterranean Sea and Red Sea, dividing Asia and Africa  .
between Europe and Asia (dividing Eurasia): along the Turkish Straits, the Caucasus, and the Urals and the Ural River (historically also north of the Caucasus, along the Kuma–Manych Depression or along the Don River) between Asia and Africa (dividing Afro-Eurasia into Africa and Eurasia): at the Isthmus of Suez between North America and South America (dividing the Americas): at some point on the Isthmus of Panama, with the most common demarcation in atlases and other sources following the Darién Mountains watershed that divides along the Colombia–Panama border where the isthmus meets the South American continent (see Darién Gap) While today the isthmus between Asia and Africa is navigable via the the Suez canal, and that between North and South America via the Panama canal, these artificial channels are not generally accepted as continent-defining boundaries in themselves. The Suez Canal happens to traverse the isthmus between the Mediterranean Sea and Red Sea, dividing Asia and Africa . The very narrow land connections are themselves regarded as naturally dividing the continents .
A
today
A
is navigable via the the Suez canal,
R
are today navigable, via the Suez and Panama canals, respectively, diversions and canals of human origin generally are not accepted on their own accord
via the Panama canal, these artificial channels are not generally accepted
R
; the
in themselves. The
A
. The very narrow land connections are themselves regarded as naturally dividing the continents