Anything related to bathymetry is superfluous since this is the only map with
no ocean at all visible.
The small area below sea level in the center of the map is the Turfan
Depression. The volcano shown at the center is listed in numerous catalogs
with a claimed eruption date of 1150 CE. But examination of Google Earth
imagery fails to reveal any volcano.
Northwest of the Turfan Depression, at about 46.3°N 86.6°E is the
Eurasian Pole of Inaccessibility, the point in Eurasia (and on earth)
farthest from any seacoast, roughly 2500 km from the nearest seacoast.