I suppose it depends on your definition of "big", but Chile and Argentina are both extremely recognisable in this map. And Greenland is obviously very easy to see, including Danmarkshavn time.

But I think the single country which is the most recognisable (even more than China, which is messed up a little by Mongolia being in the same time zone) might be India, as well as neighbouring Pakistan and Sri Lanka. Afghanistan and Iran are also nearly perfectly shown here, as is Myanmar.