Those who recognize the reality of the global Flood have always appreciated its destructive and erosive power, and have accordingly concluded that the antediluvian Tigris and Euphrates Rivers were obliterated. So long as river courses had been understood as forming as the result of shallow-crustal processes, such deductions are entirely consonant with available evidence. New geologic evidence, however, indicates that the courses of major rivers are governed by deep-crustal features. This opens up the serious possibility that the postdiluvian Tigris-Euphrates River system has reappeared at or close to the location and trend of its antediluvian counterpart—all despite the deposition of thousands of meters of Flood sediment. New geologic evidence undercuts the claim of compromising evangelicals that the retention of antediluvian place-names necessarily implies a local flood instead of a global one.