From here Witsen - image list

The caption under the engraving this screenshot part of reads;
"Mongolian Nun Mongolian Lama or Priest."
If the caption is accurate then are the pair of Mongolians in another part of Tartary or were there really palm trees in Mongolia once upon a time (1692) or did Mongolia shrink over time and once it had sub tropical lands within it?

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Mongolian Palm Trees