Dramatic footage from local media showed a huge wave rushing down the Beishi River in New Taipei City where 24 people on a company trip were hiking yesterday, despite official warnings of torrential rain.
Hiking along river canyons, known locally as river tracing, is increasingly popular in Taiwan, with participants wading and climbing through the water.
Six of the group were swept away by the wave but one 15- year-old girl managed to grab hold of some driftwood and later scrambled to safety.
Footage on the Apple Daily website showed rescue workers pulling one of the women from the water and desperately trying to resuscitate her, but in vain.
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Rescuers are continuing to search for a missing 44-year- old woman.
The teenage survivor climbed onto a rock to wait for the water to recede before walking to nearby houses to seek help around dawn, her mother Chen Li-hsiang told reporters.
"It was dark so she sat on the rock for the water to go down... She is a calm child. She waited till the water receded so she can safely get on shore... And walked on her own to seek help when dawn came," Chen said.