Most of the borders of the Lunar satrapies (other than Silver Shadow, which was defined by the naturally occurring Glowline emanating out of the Crater) follow rivers. However, the Oronin satrapy - taking over much of the Carmanian heartlands - has two straight borders with its neighboring satrapies (Doblian and Karasal) radiating out from some (rather random?) point in the Silver Shadow, somewhere southwest of the Crater in the Guide, somewhere in the western part of the Crater area in the Sourcebook's 5th Wane map.
I wonder how this border came about. The only measurable thing I can see for these two borders would be the shared day of the Full Moon effect, somethng very unique as all the other satrapies straddle more than one seventh of the circular border of the Silver Shadow.
The Redline History tells us that the clan of Vakthan, a son of the Red Emperor, more or less single-handedly cowed the rebellions in the West Reaches in the first and earliest second wane. That means that the Empire used a system of satrapies already that early, although the Redline History only shows the Heartland satrapies for the Fifth Wane.
Have the satrapies retained their area throughout the history of the established Lunar Empire? Or did Sheng Seleris's interregnum depopulate existing organisational structures in the west to an extent that new satrapy borders could be drawn in effectively no man's land? Could there be a ghost satrapy, lost to the ravages of Sheng, with a satrapial mansion still in upper Glamour?
Doblian and Oronin satrapies cover half of the original lands of the Lion Shahs of Carmania. Northern Oronin has quite a bit of Spolite territory, or at least some of the heartlands of the Spolite Empire that Syranthir's followers destroyed, and the empire of his son kept hold of.
Do we have any records about the internal organization of Carmania before its conquest of Dara Happa?