Some of RodrÃguez ' case-studies go some way toward exploring this question, but it pretty well remains terra incognita within terra obscura.
It is still sort of terra incognita we have to cope with.
The symmetrically placed hypothetical islands in the great continuousocean disappeared, and the oekumene acquired a new form by the representation of the Indian Ocean as a larger Mediterranean completely cut off by land from the Atlantic. The terra incognita uniting Africa and Farther Asia was an unfortunate hypothesis which helped to retard exploration.