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The confluence of the Green and Colorado Rivers, now in Canyonlands National Park, near popular tourist destination Moab, still cannot be reached or viewed easily. Much of the surrounding region remained remote and rarely visited for decades after settlement of other parts of the West. The first U.S. government expedition to explore the canyon country and the Four Corners area was led by John Macomb of the army's topographical engineers.The soldiers and scientists followed in part the Old Spanish Trail, whose location they documented and verified. Seeking to find the confluence of

Geological surveys --- Scientific expeditions --- Canyons --- Paleontology --- History --- Macomb, J. N. --- Travel --- United States. --- Four Corners Region --- Colorado River (Colo.-Mexico) --- Geography. --- Discovery and exploration. --- Fossilogy --- Fossilology --- Palaeontology --- Paleontology, Zoological --- Paleozoology --- Cañons --- Expeditions, Scientific --- Scientific voyages --- Travels --- Voyages, Scientific --- Geology --- Surveys --- Macomb, John N., --- Macomb, John Navarre, --- U.S. Army Topographical Engineers --- U.S. Army Topographical Engineer Corps --- U.S. Army Corps of Topographical Engineers --- U.S. Corps of Topographical Engineers --- United States Corps of Topographical Engineers --- Corps of Topographical Engineers (U.S.) --- U.S. Bureau of Topographical Engineers --- United States Bureau of Topographical Engineers --- U.S. Army Bureau of Topographical Engineers --- Bureau of Topographical Engineers (U.S.) --- U.S. Topographical Engineers --- United States Topographical Engineers --- Topographical Engineers (U.S.) --- Historical geology --- Zoology --- Fossils --- Prehistoric animals in motion pictures --- Valleys --- Voyages and travels --- Southwest, New