Hot springs have been used by humans for thousands of years. From Roman baths to Japanese Onsen, and from Iceland’s Blue Lagoon to Indonesia’s hidden jungle springs.
More than just a place to relax, hot springs are nature’s therapy. A perfect mix of heat, minerals, and natural beauty.
For trekkers, especially after conquering mountains like Mount Rinjani, a hot spring is not a luxury. It’s recovery.
In this complete guide, we will talk about everything you need to know about hot springs.
- WHAT IS A HOT SPRING?
A hot spring is a source of groundwater that comes out to the surface in a naturally hot state.
The water temperature can be from 37°C to 100°C depending on the depth and volcanic activity underground.
In Indonesia, almost all hot springs are located in volcanic areas. Because Indonesia is in the “Pacific Ring of Fire”.
This means that we have hundreds of active volcanoes. And that’s a blessing, because geothermal heat heats groundwater and dissolves minerals.
The water that comes out is not ordinary water. This water has been “cooked” by the earth for decades, passing through layers of rock and minerals.
- 7 BENEFITS OF HOT SPRINGS FOR HEALTH & RECOVERY
Why are Rinjani climbers so obligated to soak in hot water after descending? Here’s why:
- Restores Muscles After Trekking
When you go down Letter E or down from the Crater Rim, your legs, thighs, and calves are definitely sore.
Warm water of 38-40°C improves blood flow. Blood carries oxygen and nutrients to the damaged muscles. The result: the soreness is reduced 70% faster.
- Reduces Inflammation & Joint Pain
Minerals such as sulfur and magnesium in hot water are naturally anti-inflammatory. Great for sprained knees while trekking.
- Cleanses the Skin Naturally
Sulfur in hot water kills acne-causing bacteria. Silica makes the skin smoother. Many people say that the skin becomes “glowing” after 3 days of soaking.
- Reduces Stress and Anxiety
Heat + water sounds + natural atmosphere trigger the brain to release the hormones endorphins and serotonin. Happy hormones. It is perfect for de-stressing after 4 days in the mountains without signal.
- Improves Sleep Quality
Taking a hot shower 1-2 hours before bed raises the body temperature. When it comes out and the temperature drops, the body sends a “it’s time to go to sleep” signal. Sleep becomes better.
- Improves Blood Circulation
Heat makes the blood vessels dilate. The heart doesn’t have to work as hard to pump blood. Great for blood pressure.
- Detox
Sweating in hot water helps the body expel toxins through the pores. Combine it with drinking plenty of water.
Important note from MRET: Do not soak for more than 20 minutes. And it is mandatory to drink water before and after.
- TYPES OF HOT SPRINGS
- Based on Temperature
– Warm: 37-40°C. Most comfortable for long soaks. Suitable for families.
– Heat: 40-50°C. For short therapy 10-15 minutes.
– Very hot: >50°C. For feet only. Don’t log in right away.
- Based on Mineral Content
– Sulfur Spring: A typical rotten egg smell. Best for skin and fungus. The color of the water is slightly bluish.
– Bicarbonate Spring: The water feels as smooth as soap. Great for dry skin and eczema.
– Spring Chloride: High salt content. Great for muscles and blood circulation.
– Radium Spring: Contains small amounts of radium. It is believed to be for rheumatism.
- ETIQUETTE & TIPS FOR BATHING IN HOT SPRINGS
To be comfortable and safe:
- Take a Shower First: Rinse before entering. This is the rule in all countries.
- Don’t Use Soap/Shampoo in the Pool: Just rinse.
- Drink Water: Heat makes dehydration fast.
- Do Not Eat Directly Before Soaking: Wait 1 hour after eating.
- Listen to the Body: Dizziness, nausea, heart palpitations = get out and rest.
- Keep it clean: Don’t throw garbage. Take your garbage home.
- Respect Nature: There are many hot springs in the forest. Don’t scribble stones.
- AIK KALAK HOT SPRINGS – RINJANI, LOMBOK
Uniqueness: It is inside Rinjani National Park. You have to trek first to get there. The water comes out directly into the river. You can soak while listening to the sound of water.
Benefits: This is a “gift” after descending from Lake Segara Anak. Sulfur water that heals abrasions and small cuts.
Access: Can only be reached via 3D2N or 4D3N Rinjani packages.