Answer: GREATDIVIDE

AnswerCrossword Clue
GREATDIVIDERocky Mountains line
GREATDIVIDETerrific space between?
GREATDIVIDERocky Mountain watershed
GREATDIVIDESignificant difference
GREATDIVIDERocky Mountains.
GREATDIVIDEWatershed of the Rocky Mountains.
GREATDIVIDEContinental backbone.
GREATDIVIDEU.S. watershed
GREATDIVIDEPassage from life to death
GREATDIVIDEPassage between life and death