Passes: gates and barriers
A key term in Chinese historical geography is guān 關 ("pass"). You can see from the shape of the character that it is framed by the two panels of a door, left and right, and that it has two upright, elaborated bars that could impede progress through the gate (I am thinking of the early forms of the character). The flanking door panels constitute the semantophore (radical, classifier) of the character, and the bars inside are the secondary semantophore, but may also simultaneously function as a phonophore.
A pass serves both to facilitate and block movement along key routes leading into and out of a country or regions within a country.
Just as I was thinking about writing this post on passes, I synchronously and serendipitously received from Alan Kennedy a reference to this highly technical article on Silk Road travel:
Irina Tupikova, Matthias Schemmel, Klaus Geus, "Travelling along the Silk Road: A new interpretation of Ptolemy’s coordinates", Max-Planck-Institut für Wissenschaftsgeschichte / Max Planck Institute for the History of Science, Preprint 465 (2014), 73 pages.
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