Lay of the Land

The entire northern frontier is mountainous - a continuous line of mountains acts as the northern border.
It's the same spine of mountains but is called by different names in different places. In the west, it's the Cruth Mountains. In the central region, it's the Black Peak Mountains. In the east, it's the Altan Tepes Mountains - and there, the mountain range broadens, with one range of mountains continuing north and the other turning sharply southeast.
These mountains tend to be thickly covered with forest vegetation, gradually thinning to bare rock toward the peaks. The average height of mountains in this range is about 4,000 feet, though many are much larger.
South of this mountain range, there are miles and miles of mountain foothills - also thickly covered with forest. In the west, hilly country extends to within half a day's travel of the Gulf of Halag; in the east, the most southerly foothills are within twenty miles of the coastline.
Much of the rest of the Duchy is flatland, sometimes with gently rolling hills.
The land slopes very gently from the northern mountains to the southern coast. The most northern flatlands (the Cruth lowlands in the west) are about 1,500 feet above sea level; the flatlands south of the Black Peak Mountains are about 1,000 above sea level.

Type

Mountain Range