As of today, out of season, returns ~November. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Rehai (the "Hot Sea") is the largest concentrated geothermal display in the Tengchong volcanic area.
The site contains dozens of boiling springs, fumaroles, mineral pools and thermal runnels set in a volcanic landscape; it is part of the Tengchong Volcano-Geothermal National Geopark and is managed as a continuous geothermal attraction rather than a short seasonal event.
Where to see it
A taste of where to see it. The full map, exact coordinates and the best timing for each spot live in the app.
| Viewing spots |
|---|
| Rehai Scenic Area - Main Entrance (Big Boiling Pot / Da Gunguo viewpoint) |
| Tengchong Volcano Park - Dayingshan / visitor center (volcanic cones viewpoint) |
| + 1 more spot, with exact coordinates and timing, in the app → |
This is the short version
This page shows a taste. The app has the full list of where to see this, the exact timing, and live conditions for 1,000+ natural phenomena worldwide, so you know the moment one is genuinely worth the trip.