Stunning 3D Map Shows Route of Every Drop of Water in United StatesWanna know where a raindrop that falls in Glacier National Park eventually ends up? Would you like to follow the headwaters of the Missouri to the Gulf of Mexico? Or just see a 3D map of where the water in your local watershed flows on its way to the sea? Click anywhere on the map of the United States, and the website drops down to a terrain following view, tracking where water flows from that very spot. It was made by a data analyst named Sam Learner with help from the US Geological Survey’s water team.