A narrow line called the continental divide separates major river systems such as the Missouri River and Columbia River, with headwaters sometimes only a few meters apart. This series will follow these two rivers from headwaters to their mouths. This is a photo essay. Many rivers start out with head water springs.
Headwater spring, Missouri River Watershed
Headwater spring, Columbia River Watershed
Some rivers have head water lakes then flow through larger lakes downstream.
Headwater lake, Columbia River Watershed
Lake, Columbia River Watershed
Headwater lake, Missouri River Watershed
Small tributary in the Columbia River Watershed
Small tributary in the Missouri River Watershed
Small tributary in the Missouri River Watershed
Tethysphere 
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