Poas

Von Jan Jose aus fuhr ich mit dem öffentlichen Bus zum Vulkan Poas. Der Vulkan Poas ist gut zu erreichen und touristisch stark erschlossen (Visitors Center mit Dokumentation). Deshalb ist aber auch der Zugang etwas beschränkt. Dem türkisgrauen Kratersee kann man sich auf ausgebauten Wegen bis ca. 200 Meter annähern. In den Krater hinein gib es keinen Zutritt.

	Country:	Costa Rica
	Subregion Name:	Costa Rica
	Volcano Type:	Stratovolcano
	Volcano Status:	Historical
	Last Eruption:	1996
	Summit Elevation:	2708 m
	Latitude:	10.20°N
	Longitude:	84.233°W
The broad, well-vegetated edifice of Poás, one of the most active volcanoes of Costa Rica, contains three craters along a N-S line. The frequently visited multi-hued summit crater lakes of the basaltic-to-dacitic volcano, which is one of Costa Rica's most prominent natural landmarks, are easily accessible by vehicle from the nearby capital city of San José. A N-S-trending fissure cutting the 2708-m-high complex stratovolcano extends to the lower northern flank, where it has produced the Congo stratovolcano and several lake-filled maars. The southernmost of the two summit crater lakes, Botos, is cold and clear and last erupted about 7500 years ago. The more prominent geothermally heated northern lake is one of the world's most acidic natural lakes, with a pH of near zero. It has been the site of frequent phreatic and phreatomagmatic eruptions since the first historical eruption was reported in 1828. Poás eruptions often include geyser-like ejection of crater lake water.