Oomis and Toi,
Whether Eretz Yisroel was flooded is a machlokes in the Gemara between R”Yochanan and Reish Lakish. The Gemara does not say that the mabul covered everything but E”Y. It is certainly possible to read that Gemara to mean that there is a machlokes whether the mabul reached E”Y but everyone agrees that it did not reach outside the Middle East.