A mysterious cave that seems to be impossible to find due to the fog. Jenna often tells travelers not to go through it if they find it, as the town has no idea where the cave may lead, or how to even find it.
"We have no idea where it goes. Jenna suggested we mount an expedition into it, but we don't have the resources. I've sent word out to Sora, she wanted to know what we find anyway. After all, she's the oldest gym leader and person in Minoru, she probably knows what's up here. She doesn't tell me, her grandson, but I know she traveled the region with grandfather. So Brandon, you should hurry up before she gets here, she hates it when people are late."
- Duncan to Brandon about the Steam Cavern.