BLAEU, J. / DE WIT, F. / COVENS, J. / MORTIER, P. - Japonia Regnum.

The rare Covens and Mortier issue of this important map of Japan and Korea, originally published by Blaeu. This was to remain the standard form of Japan until the eighteenth century and although replaced by the maps of Reland and Kaempfer, it is in its outline, closer to the true shape of Japan than either of these or indeed any printed map before the nineteenth century. It was compiled by Father Martino Martini, an Italian Jesuit, and appears in Blaeu's "Atlas Sinensis", the first European atlas of China.
It is the first map to correctly show Korea as a peninsula.