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…
A planet (or city, valley ect) where those who enter witness protection can escape old age and death itself, so they can live for centuries without aging-provided they maintain their cover perfectly. If they are outed by anyone or ever utter their true name, they age the number of years they have not aged since the day they entered witness protection (which might mean that they age centuries in seconds and crumble into dust and bone.)