line - a spatial location defined by a real or imaginary unidimensional extent

continental divide - the watershed of a continent (especially the watershed of North America formed by a series of mountain ridges)

Great Divide - that part of the continental divide formed by the Rocky Mountains in the United States

juncture, occasion - an event that occurs at a critical time; "at such junctures he always had an impulse to leave"; "it was needed only on special occasions"

Fall of Man - (Judeo-Christian mythology) when Adam and Eve ate of the fruit of the tree of knowledge of good and evil in the Garden of Eden, God punished them by driving them out of the Garden and into the world where they would be subject to sickness and pain and eventual death

road to Damascus - a sudden turning point in a person's life (similar to the sudden conversion of the Apostle Paul on the road from Jerusalem to Damascus of arrest Christians)