North America's Proterozoic geology provides evidence for enormous erosion and the formation of extensive water flow systems, even spanning the continent. It is proposed that these processes may be correlated with the early Creation Week and early Flood. The emergence of land on Day Three implies the formation of a topographic gradient from land to the sea, and associated water movement, on land and under sea, with immense runoff from the newly emergent land. This article infers that what is now southeastern North America became a region of pre-Flood mountains. Immediate pre-Flood topography was drastically changed by the erosional effect of the Flood's prolonged and globally extensive rain. Even high mountains were not spared. This article infers that today's Grenville, Mazatzal, and Yavapai provinces in southeastern North America represent the roots of mountains eroded in the Flood.