This is a map of the Tweed Valley—the part of Northumbria that the Gododdin think of as theirs (when they weren’t squabbling with the Manau Gododdin, their northern cousins)—as I imagined Hild might have experienced it. At some point I’ll update to software that can bend text and annotate it properly with all the river names. (For now, see this.) The red bits are hills with Iron Age strongholds. The heavy lines are Roman roads, the light Hild’s route, and the pink (from right to left) Roman fort, camp, and stones. I had to reverse engineer some of the names, e.g. Pebyl for Peebles, and Calchfynydd for Kelso. And I decided the Tweed, in Hild’s time, would have been the Twid.
Here’s the bit in the box, expanded:
The topological stuff is pretty accurate, I think; any definite contour line (as opposed to artistic shading) begins at 200m; this is high country. The heavy lines are Roman roads—Dere Street is reasonably accurate but the east-west route is largely extrapolation, as are the dotted lines that I imagine to be paths through the hills.
This is where Hild, in company with the men who become known as her Fiercesomes, acquires a northern name, Cait Sith (hence the wee picture). But you’ll have to wait to find out why…