I tried something similar using Schley overland symbols in this map

Here is a dungeon map, very much in progress. It is meant to be an adventure dungeon, in the world of Tatilana, in the region of the Free towns of Chevronyaguar, to the east of the town of Bilederovo (where the adventures have their home base).

Here is the first room of the dungeon, as the players see it at first, after climbing down the slippery cracked stone staircase from the sinister hollow above. A ring of damaged columns in a circular room, with two of the columns having collapsed on the floor and a lot of litter, pots, most broken, and an overgrowth of sickly fungi at the far wall. Doors are seen closed on the east and west walls, made of stone. Rocks also are on the ground, seemingly have fallen from the cracked stone domed roof above, which looks not very secure.

Unfortunately, there are a few other features that escape the players' notice initially. Four huge venomous snakes, and dangerous pits before each of the doors wait to crush the hopes of the adventures in finding the fabled treasures of the long dead sorcorer Boris the Bloated.

The last of the regions detailed - the republic of Ruslana. Mainly Slavic (Ukrainian, of course) names

And his lady wife

Update. The style is getting more to what I want. I have altered the mountain contours, and added ethnic groups, plus national borders, some forests and a marsh, and some more names.

Sorry for the small text, but it is meant to be viewed at a larger canvas. When I have finished the text, I will put a 8Mb version in the gallery.