https : / / www. researchgate. net / profile / kaspar - hurni / publication / 3 1 5 7 4 1 4 9 7 / figure / fig 6 / as : 6 6 8 7 9 5 0 6 4 5 4 9 3 9 3 @ 1 5 3 6 4 6 4 5 7 7 8 1 2 / the - mainland - southeast - asia - msea - region - and - the - seven - footprints - three - in - the - north. png, in style of 1 7 th century map, high accuracy, based on geographical map,