There are two major discrepancies from known coastlines: the North American coast mentioned above, and the southern portion of the South American coast. On the Piri Reis map, the latter is shown bending off sharply to the east starting around present-day Rio de Janeiro. Another interpretation of this territory has been to identify this section with the Queen Maud Land coast of Antarctica. This claim is generally traced to Arlington H. Mallery, a civil engineer and amateur archaeologist who was a supporter of pre-Columbian trans-oceanic contact hypotheses. Though his assertions were not well received by scholars, they were revived in Charles Hapgood's 1966 book "Maps of the Ancient Sea Kings". This book proposed a theory of global exploration by a pre-classical undiscovered civilisation based on his analysis of this and other ancient and late-medieval maps. More notoriously, these claims were repeated in Erich von Däniken's "Chariots of the Gods?" (which attributed the knowledge of the coast to extraterrestrials) and Gavin Menzies's "" (which attributed it to supposed Chinese voyages), both of which were roundly denounced by mainstream scholars.