Thanks, Aldwen, for this brilliant map. The original Native map often hampered my sense of immersion in the game, with its illogically placed castles and villages seemingly arranged to be equidistant instead of in any intuitive, organic way. To cite a quick example of how much fun your map makes the game, it turned a simple trip from Rivacheg up into the Vaegir mountains a thrill ride, as I had to wait for local Lords to drive deserter bands from the mountain pass up to Khudan before I dared move my battle-depleted party - with the old map I would have just yawned and made a wide semicircle around the danger. Well done!
Since save game compatibility is a hot topic for discussion, I am happy to report that I was able to switch to your map in a 250+ day old saved game I was playing using the 1257 mod. My game was saved at night with my party inside a city (Wercheg) and no other parties visible nearby. Afterwards I rode out to check on some castle sieges that I knew had begun before I switched maps - the armies were still there and able to capture their objectives, even though I am guessing that your mod changed their altitudes.
(By the way, as a big fan of the 1257 Edition realism mod I have to say that your realistic map is a perfect addition to it. The Rhodok/Khergit border always seemed so arbitrary to me before.)