The Marches be a vast sea of grass dividing the civilized parts of The Land.
Corvis is a western region of The Land, comprising several small counties. It is a magical place, filled filled with fruitful farms, green rolling hills, low stone walls built up over centuries, and a number of small forests. The people are happy and content. It is an ideal place.
Most of the time. And it depends on what you think is ideal…
The Chinese, when attacking a castle or fort, flew kites over the city wall and used the length of string it took to get it there as a measurement to know how far they had to dig a tunnel to get under the wall.