The Lightning Swamp got its name from the Will O' Wisps that lead travelers astray in the night.
Lightning Swamp is considered by most Hillfolk to be an extremely dangerous place. That doesn't stop a few families from living there. Most of these families (but not all) are part of the Hills Rising Movement movement. Most notably is The General who runs The General Store on the edges of the Lightning Swamp, and Dem Boys who run a still deep in the swamp.
Since the Swamp is feed from the Egg Creek hot spring, it is much warmer than the rest of the Harvest Hills Region, and beasts not seen anywhere else along the Iron Maw Mountains can be found there.