Wulai Neidong Hot Spring

Deep in the gorge above Wulai, a township in New Taipei City carved by the Nanshi River, a natural hot spring surfaces amid subtropical forest where the Atayal indigenous community has bathed for generations. The source delivers water at 42 °C — a temperature that feels enveloping against the cool, humid mountain air that pervades this narrow valley.

The spring's sodium-chloride and bicarbonate composition, combined with a markedly alkaline pH of 9.1, produces the silky, skin-softening quality that has made Wulai one of Taiwan's most storied hot spring districts. The high pH alone gives the water a smooth, almost slippery texture — a characteristic Taiwanese bathers call bijin-no-yu in borrowed Japanese parlance. Surrounded by waterfalls and dense forest, the Neidong area offers a wilder, less commercialised face of Wulai's spring culture, where the experience of soaking remains grounded in the landscape itself.