Petalgrove is one of The Grand Kingdom territories.

It is the natural swampy homeland of the Orcs, and resides south of Calenburst. It's capital is the forever night city of Blackwood. 

Many diseases flourish in the damp marsh.

Since it is mostly murky marsh and wetland, working out a border for it is very difficult and has resulted in the deaths of countless mappers and cartographers. The indistinct border that has internationally been agreed upon mainly consists of the area around the swamps.