This entity begins at Cape Prince of Wales on Alaska's North Slope, and Grays Peak in Colorado is the highest point along this entity. This entity separates Glacier National Park and Waterton Lakes National Park in northern Montana, and a community in central Montana is named for this entity. All rivers east of this entity drain towards the Atlantic Ocean, and all bodies of water west of this entity drain towards the Pacific Ocean. For 10 points, name this entity which runs along the Rocky Mountains through the western United States, separating drainage basins.
a) Continental Divide
b) Appalachian Trail
c) Great Divide
d) Sierra Nevada