I happened to have this 1602 world map that first detailed five continents, if you don't know what I am talking about check it out here:

http://www.guardian.co.uk/world/2010/jan/13/1602-chinese-map-washington

Wikipedia:

http://en.wikipedia.org/wiki/Kunyu_Wanguo_Quantu

Preview:

http://i.imgur.com/jFBdO.jpg

Download it here

http://est.im/downloads/KunYuWanGuoQuanTu.rar (35MB)

two 12020x10772 jpeg for western sphere and eastern sphere, plus one 6351x2880 jpeg global map

Enjoy!

Credits: http://bbs.godeyes.cn/showtopic-210833.aspx

looks like the picture is released to public domain. Correct me if I am wrong.