In the episode titled, 'Heavy Lies the Crown' Clarke has a list of unknown locations that includes: Rendon, Doah, Reva, Rappahan, Mana, Drom, Woodstock, Rockburn, Xandria, Beda, Nadal, Bowie, Dalk, Aldo, and Nopar. Where are they located?
It appears most of these are corruptions/abbreviations of current cities/locations in and around the Eastern seaboard such as Virginia and D.C. Others are likely new names that emerged. E.g. The most likely explanation of the TonDC placename is Washington D.C. Other names would possibly be as listed below. The likelihood of these being correct is reinforced if one looks at the listing seeing that it starts with those in Virginia and ends with those in Maryland. While there are a couple of names I could not identify, if my theory is correct, there should be place names in the respective states which correspond do the names I could not immediately identify.
In particular if one traces a line starting at Dundalk, MD and draws a line Southwest through Washington D.D. to the Shenandoah park/river area, one can see how the place names are in a rough scatter pattern around that line.
Rendon - Herndon, VA
Doah - Shenandoah River Valley, VA
Reva - Reva, VA
Rappahan - Rappahannock River & Rappahannock County, VA
Mana - Manassas, VA
Drom - ??
Woodstock - Woodstock (likely the VA or MD location, not the original NY. But based on the theory above, likely VA given proximity to other VA cities.)
Rockburn - Rockburn Farm, VA
Xandria - Alexandria, VA
Beda - Bethesda, MD
Nadal - Ananndale, MD?
Bowie - Bowie, MD
Dalk - Dundalk, MD
Aldo - Waldorf, MD
Nopar - North Potomac, MD?