This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Traverse Gap and Big Stone Lake. Topographic map of Traverse Gap between Lake Traverse in bed of Glacial Lake Agassiz and Big Stone Lake in bed of Glacial River Warren the prehistoric outlet to Lake Agassiz in South Dakota and Minnesota in central North America from National Atlas Mapmaker nationalatlas gov asp PDUSGov Geological