But there's one lake you won't find on any map, Lake Agassiz. This gigantic glacial lake, which covered parts of Canada, North Dakota, and Northwestern Minnesota, drained away thousands of years ago.

When the data analysis is complete, results will provide state-of-the-art, subsurface maps that will contribute to a wide range of 3D representations of the nation’s exposed and concealed geology.

Flyover Country uses maps and geology databases to identify features of the landscape as a plane flies over them, no Wifi necessary Emily Matchar - Innovation Correspondent March 10, 2016 ...