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Costa Rican Volcano Parks and Reserves.

The geological activity that led to the formation of Costa Rica´s volcanoes continues today generating the spectacular eruptions at Arenal and the boiling mud pots, geysers and hotsprings at Irazú, Rincón de la Vieja and others.

Volcan Arenal (1,633 meters) is a picture-perfect cone. It´s also Costa Rica´s most active volcano and a must-see on any tourist´s itinerary.

The slopes north of Cartago rise gradually up the flanks of Volcan Irazú. The views from on high are stupendous.

Poás (2,708 meters) is a restless giant with a 40-year active cycle. It erupted moderately in the early 1950s and was briefly active in 1989, when the access road was closed, and again in May 1994, when the park was temporarily closed. In July and August 1994, it rumbled dramatically. The park is frequently closed to visitors because of pungent and irritating sulfur gas emissions--many plants bear the scars of acid attacks.