- May 2014
Are there any passes in the northern and western parts of Transylvania?"Less solid" ... You sure, my friend?
I think You've forgotten geography: Transylvania has montains at the southern and eastern border! With average heights of 1500m, going up to more than 2.000m, with not so much valeys/canions traversing them. Plus, the passing zones where populated mostly by Hungarians and Germans. On the other hand, the Hungarian continuum is on gigh plains/plains, large valleys. Difficult access vs easy access.
An administrative map of Hungary from the17th C.
Wath's interesting in it is that the three most important acces points/trading routes are controled by German communities (Hermanstadt/Sibiu/Szeben), Kronstadt (Brasso/Brasov) and Bistritz (Bistrita/Beszterce). There is one in Székelyföld.
PS: I was talking about the accuracy of the ethnic map. I found one that it's at municipality level. If You have the time to loock a bit closer, You'll see what I meant: there are more than one place where the "clusters"/"pockets" are very small. (100 years ago it was even more complex, as the German, Jewish, Slav where more present than today)
(here's the link for high-resolution img, if You wanna look closer: https://upload.wikimedia.org/wikipedia/commons/d/dd/EthnoRom30actualise.JPG