Kathrin Strempel, 49, jabbed her foot on a sharp bamboo spike as she and Jurgen Strempel, 51, tried to find their way out of the Khao Phra Taew national park surrounding Phuket's popular Bang Pae waterfall.
The couple went for a hike about 4pm and called the Tourist Police emergency 1155 hotline about 8.50pm, officials said. At that stage, according to the telephone call, they were close to ''Sign No. 11.''
Tourist Police combined with park staff and searched in two groups, eventually locating the couple after they lit a fire for guidance. The couple were brought out at 1.50am after Kusoldharm Foundation volunteers treated Kathrin Stempel.
She was admitted to Phuket international Hospital in Phuket City.