This map can be found on page 545 of Baedeker's Handbook. This particular copy was made accessible by the Getty Research Institute and HathiTrust. Click here to read the catalog entry.
The plans in this collection are annotated and tagged in theā¦
I am reasonably sure that this is the only place in the empire where a currier had to dismount and climb into a boat (here to cross the Kerch Strait) in order to continue along his route.