Lake Poudre in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado. (The towering Front Range is the first mountain range encountered by white settlers years ago, and travelers today, moving west along the 40th parallel north across the Great Plains of North America). Lake Poudre lies a stone's throw to the east of the Continental Divide, park's high-point spine of rocks, east of which waters (including Lake Poudre's) eventually flow to the Atlantic Ocean or Gulf of Mexico, and west of which waters eventually reach the Pacific Ocean. Photo by Carol Highsmith.