Maria del Rocio Venegas Chavarria spent two days in the Chirripo National Park, lost and with only a chocolate bar and water from a lagoon to help survive.
The nurse got lost in the area known as Valle de las Morrenas, near the Chirripo summit.
Cerro Chirripó is the highest mountain in Costa Rica, with an elevation of 3,820 metres (12,533 ft).