Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
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Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Su'ao Cold Spring in Yilan County is one of Taiwan's most extraordinary natural wonders — one of only two natural cold carbonate springs in the world — where naturally carbonated bicarbonate-rich water bubbles up at 22°C, creating a sparkling, champagne-like bathing experience. The carbonation tingles on the skin and is believed to promote circulation, making the experience simultaneously invigorating and therapeutic. Su'ao's cold spring, set against the backdrop of Yilan's verdant coastal mountains and the Pacific Ocean, offers a completely unique thermal phenomenon unlike anything else in East Asian spa culture.
Insider tip — Su'ao Cold Spring is a geological rarity — a naturally carbonated cold spring rising at 22°C in the foothills of northeast Taiwan, though bathing pools are typically heated to around 35°C for comfort. The high CO2 content turns the water gently effervescent on the skin, mimicking the feel of sparkling mineral water. The harbor town of Su'ao sits at the southern end of the Northeast Coast Scenic Area, backed by forested mountains that descend steeply to the Pacific. Pair a visit with a bowl of Su'ao's famous cold-spring lamb noodles, a local specialty.
