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The Poas Volcano is located north of Alajuela City, 56 kilometers ( 35 miles ) from San Jose City. Driving time: 2 hours.
Poas Volcano Half Day No meals included. Poas Volcano, Grecia and Sarchi Lunch included. Wear sneakers, blue jeans and pullover or jacket, rain gear..
Poas is an andestic-basaltic stratovolcano 2.708 m high. It is impressively beautiful and is one of the three volcanoes on the continent that are accessible along a paved road that almost reaches the crater edge. Subconical in shape, the upper part has three caldera depressions. The main crater is an enormous hollow almost 2 km in diameter and 300 m deep. At the bottom of this crater there is a thermomineral lagoon some 350 m across. When it occasionally dries out, the sulphur emissions become more intense and produce acid rain that damages the vegetation and the fields on its sides. To the north of the active crater, there is the von Frantzius cone, the oldest eruption point, which today is inactive, on the peak of the massif. To the southwest, there is one cone called Botos, which is currently occupied by a very beautiful cold water lagoon some 400 m across. The volcano experiences plumiforme cyclical eruptions similar to those of a geyser, which consists of columns of muddly water together with steam that rise from a few meters to several kilometers. These eruptions have made Poas famous as the biggest geyser around the world. The park has four main habitats. One area around the crater is devoid of vegetation or with only a few adapted species like the paddle fern ( Elaphoglossum lingua ). The area of the arrayans ( Pernettya coriacea and Vaccinium poasanum ) is covered in dwarf vegetation that does grow over 3 m high. The stunted forest can be seen along the path between the main crater and Botos lagoon. It is almost impenetrable and is made up of very twisted trees. The cloud forest, very moist and shady, surrounds the Botos Lagoon and the part behind Potrero Grande. Here, most of the trees reach 20 m high and are almost completely covered of mosses, Hepaticae and other epiphytic plants
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