f75r as the Caspian and Aral Seas

[Linda]

It had bothered me that the finial in the diagram had no ancient volcanic analogue in the actual terrain as it does in other cases, the land to the north of the sea is flat. But i finally realized that the canopy extends much further, to where all the rivers entering the northern portion of the sea originate, the Ural mountains, which are in fact interspersed with Silurian volcanic rock.



Also came across this 1525 Piri Reis map which includes all the features of those from the 1700s.