Also known as the Plain of Storms, the Tomb of Taranis, the Graveyard of Thunder, and other colorful names
Lightning elementals are rare, the conditions required for a bolt of lightning to become self sustaining and self aware are very unusual and uncommon. As such, artificial elementals far outnumber wild ones.
In a high canyon in the mountains, the players find a skeleton in a cage suspended from a pole. A few miles further, they find another, and a third contains a partially rotten corpse. The fourth contains a living man who looks as if he hasn't eaten in days. Turns out to be the local way of punishing criminals.