Onyang Oncheon
Onyang, Asan, South Chungcheong Province, South Korea, South Korea
- Location
- Onyang, Asan, South Chungcheong Province, South Korea, South Korea
- Water type
- sodium chloride
- Temperature
- 40 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Onyang Oncheon, in Asan, South Chungcheong province, ranks among Korea's oldest hot springs, used for centuries. Its sodium-chloride water emerges at 40°C, with multi-temperature pools, a sauna, sleep room, and massage.
Insider tip — Onyang Oncheon claims to be the oldest continuously used hot spring in Korea, with records dating back to the Silla Kingdom over a thousand years ago. The alkaline sodium-chloride waters flow at a steady temperature ideal for long, relaxing soaks, and the district retains a pleasantly old-fashioned character with small family bathhouses alongside modern complexes. The adjacent Onyang Folk Museum is worth pairing with your visit.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).