Alright, I've thrown together this rough map of the rivers the Count could be traveling on, based on Mina's analysis of the situation:
As you can see, the orange line is Pruth (or Prut) River, the red line is Sereth (or Siret/Sireth) River, and the purple line is Bistriza (Bistrița) River. The Bistriza does sort of do a little loop around Borgo Pass as Mina mentions, which is neat.
I've also included Galatz, as well as Bistritz (the town) and Borgo Pass at the red starred pinpoint, which is near where Castle Dracula is.
Also, I don't know what Mina means by "Fundu," because the closest "Fundu" I could find where the Bistriza joins the Sereth was a little village named Fundu Văii which isn't at the place where the Bistriza joins the Sereth. It's close by though, so that's my best guess.
Also also, I'm not a cartographer, so if anybody wants to, feel free to provide more information or even their own map.
Bonus thing:
Jonathan theorizes that the Count would cross from the river to the Carpathians somewhere around the 47th degree, north latitude:
me when its tmagp episode three already and theres still no 140k words gwen bouchard x alice dyer slowburn hurt/comfort trying to murder each other falling in love instead: 🤯
this truly is the hardest question. :( but after much consideration, I think Endless Halloween Night wins out for me, because it's nonstop Characters Being Silly the whole way through. the whole thing is just lots of these little dorks having the most ridiculous interactions, which is always my favorite! and of course the big twist is SO delightfully stupid and doubles down SO hard that it becomes AMAZING and I 100% unironically adore it. AND it's Halloween! everyone is in their cute little costumes and having a spooky adventure! it's great!
however, I am ALSO a big fan of the Harveston event! how can I not be! everyone is wearing comfy winter outfits and getting along really weirdly well with Epel's grandma and he's getting a little worried about that! my terrible loud son sews a plush squirrel and then gives it a silly little nickname and refuses to leave it behind when it breaks! the ending shot with the sled! I LOVE IT.
"Both of you, faithless fools who would dare to take up arms against the king of earth and sky!"
The words "Zonai Ganondorf" entered my head and I haven't been sane since. Perhaps in the Zonai version of the legend, the warlord "Gannon" sought after the secret stones, and the incarnation of Hylia draconified herself to stop him alongside the Ancient Hero.