Irosin Hot Springs
San Benon
Irosin Hot Springs
sulfur · Bicol Region
Hotter than 53% of Philippines springs (n=19).
More acidic than 14% of Philippines springs (n=14).
Mineral profile
Bar width reflects listing order, not measured concentration.
Suitability
At a glance
Getting there
Moderate — a short ride from a station
About this spring
A collection of public thermal pools situated directly at the base of the active Mount Bulusan volcano. The pools are consistently replenished by natural, mineral-rich sulfuric water flowing from the volcano's active thermal vents. It serves as a central health and relaxation hub for travelers exploring the rugged Sorsogon province.
Highlights
History
These sulfur pools sit restlessly at the base of Mount Bulusan, a highly volatile peak that frequently reminds the province of its power with eruptions in 2017, 2022, and 2023.
As the southernmost province of Luzon, Sorsogon historically served as a vital naval highway during the Spanish galleon trade era. Today, the region is better known to travelers as a jumping-off point for swimming with gentle whale sharks in nearby Donsol. These springs offer a fascinating chance to relax in waters heated by one of the most active volcanic engines in the country.
Local guide
As you approach the site, the massive green cone of Mount Bulusan volcano dominates the horizon. The public grounds are spacious, featuring large concrete pools filled with warm, yellowish sulfuric water. It is a popular, friendly community hub where travelers and locals mingle freely.
The water feels thick with minerals and carries that signature volcanic sulfur aroma. Bring your standard swimming clothes, a towel, and slip-resistant sandals for the wet walkways. The pools fill up quickly with locals after the standard working hours end.
Mid-morning on a weekday is the best time for a relaxing swim with plenty of space. There is a casual canteen on the property serving hot bowls of noodle soup and fried snacks. Watching the mountain mist wrap around the volcano while you soak is deeply peaceful.
Mineral chemistry
Water character inferred from mineral type — verify on site.
Sulfuric hot springs are among the most studied in balneology worldwide. The sulfur compounds, primarily hydrogen sulfide and thiosulfate, have documented antimicrobial and anti-inflammatory properties. Regular bathing is associated with relief from chronic skin conditions including eczema and psoriasis, as well as joint inflammation and muscle soreness. Sulfuric waters have been used therapeutically across Asia and Europe for centuries.
The distinctive rotten-egg smell dissipates quickly after leaving the bath. Avoid if you have a sulfur allergy, very sensitive skin, or respiratory conditions. Remove silver jewellery before entering — sulfur will blacken it permanently.
Sulfate springs contain dissolved calcium, sodium, or magnesium sulfate. Calcium sulfate springs are traditionally associated with wound healing and post-surgical recovery.
Sodium sulfate springs can have a mild laxative effect in sensitive individuals — stay well hydrated.
Similar springs
Situated at the base of Mount Balungao, an extinct volcano, this site offers natural hot spring pools within an adventure park complex. The mineral-rich volcanic water is channeled into tiered concrete swimming areas of varying temperatures. Visitors can combine therapeutic thermal soaking with adventure activities like zip-lining across the volcanic landscape.
A government-managed natural eco-reserve nestled high on the scenic, forested slopes of the active Mount Kanlaon volcano. The park features dedicated stone-lined sulfur dipping pools fed by natural hot water channels originating deep within the volcano. The thermal pools are beautifully integrated into an expansive mountain forest filled with waterfalls and a massive bat sanctuary.
A rustic, lesser-known hot spring site situated at the base of Mount Banahaw where therapeutic sulfuric water surfaces near a natural mountain riverbed. The area is basic and local, featuring straightforward public dipping pools built to catch the thermal overflow. It is heavily favored by locals who seek the healing benefits of Banahaw's volcanic activity without large crowds.
This popular mountain escape features a tiled outdoor pool filled with circulating thermal waters. It sits nestled in a deeply forested river valley characterized by distinct rust-colored geological formations. The refreshing mountain air provides a stark and welcome contrast to the steaming therapeutic waters of the spring.
Amenities
Getting there
Take a Manila-to-Matnog bus line, alight directly at the town of Irosin, and take a quick short tricycle ride to Barangay San Benon.
Location & nearby
Barangay San Benon, Irosin, Sorsogon
Common questions
What is the water temperature at Irosin Hot Springs?▾
The water temperature at Irosin Hot Springs ranges up to 42°C (minimum around 37°C).
Is Irosin Hot Springs free to visit?▾
Irosin Hot Springs charges an entrance fee in PHP.
Is Irosin Hot Springs a public or private bath?▾
Irosin Hot Springs is a public bathing spring.
Are tattoos allowed at Irosin Hot Springs?▾
Yes, Irosin Hot Springs welcomes visitors with tattoos.
What is the nearest station to Irosin Hot Springs?▾
The nearest station to Irosin Hot Springs is Irosin Bus Terminal, about 4km away.