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I am trying to provide an answer with more details on the history of East European cartography, and, while I am lacking the necessary time and especially competence, I'll try ti improve this in time.
I have posted another answer on the origin of the name Bessarabia based on an article by the Romanian historian Marian Coman which explains very convincingly how such confusions have appeared because of the way Eastern Europe was initially put on the map by European cartographers.
The answer would lead to the conclusion that those maps are simply wrong, because cartographers were oftencopying old maps which were imprecise and erroneous even when better ones were available. In fact other contemporary maps are clearly NOT showing those "Ottoman sanjaks north of the Danube" (see first maps in the question).
The odd precision of the wrong maps comes from applying precision as a method to an insufficient sum of knowledge extracted from old and imprecise maps.
Thus, people arrived from this
to this
and then to this, which gives a false impression of fidelity:
But its increased fidelity is just in the drawing and printing, not in the information.
The map by Gastaldi & Forlani, La Discrittione della Transilvania..., Venice, 1566, shows Bulgaria both north and south of the Danube without more reason than the fact Wallachia appears thrice and that Bessarabia is put there to initiate a tradition that was called by M. Coman "the cartographic invention" of that region.
Upvote:-1
I think it is a "point of view", a wish of Ottomans. I think it was a important trade across the Danube. On this map you can see "Vestigia Pontis lignei antiqua", on "Via lapidea Imperator Trajan". This is the Sucidava-Gigen Bridge or Dolni-Vadin-Grojibodu bridge. Far more strange on many of this maps the southest mouth of the Danube is at : Constanta=Proslavita until 1800.