🇺🇸 USA · Williston, Florida
♨ Temperature
22°C
⛰ Altitude
20 m
⚗ pH
7.4
💧 TDS
280 mg/L
🌊 Flow rate
Subterranean spring, no surface measurement
📅 Established
Private operation; spring used by Paleo-Americans 7,500+ years ago
✓ Verified on 2026-07-23
Devil's Den is a dry cave with a natural underground spring, formed when the roof of a limestone cavern partially collapsed to reveal the spring pool below. The name derives from the steam that forms in winter mornings when warm spring water meets cool air — early settlers thought the vapors looked like smoke from the devil's lair. Archaeological finds indicate human use of the spring going back at least 7,500 years. The spring maintains a constant 22°C and extraordinary clarity. Visitors can snorkel in the cavern pool; certified divers can explore the submerged cave passages. Not suitable for young children due to the ladder entry.