Photographer's Note

You can count more than 60 volvanoes in Costa-Rica, but only 5 are still active : Irazú, Poás, Arenal, Rincon de la Vieja and Turrialba.

IRAZU is the highest of them (3432m) and is situated in the Central Cordillera, not far from Cartago or San Jose the capital.
It is about 854000 years old and has erupted at least 23 times since its first recorded eruption in 1723.
Its most famous eruption lasted from 1963 to 1965, and began when President Kennedy started a state visit to Costa Rica. It showered San Jose and most of the Central Highlands with ash.
The latest eruption occurred on December 8th 1994, and lasted only one day.
The volcano has several craters, the most famous being this main crater, with its green lake full of acid water. Depth : 300m. Diameter : 1065m.
The surroundings are covered with "Gunnera Manicata" or giant rhubarb (see my pic 49), an endemic plant to South and Central America, which thrives better in humid, more fertile soil, which isn't the case along the craters.
However, the slopes of the volcano are very fertile, and as we were going up on the bus, we could see a lot of people working in the fields.

If you look at the satellite map, the different craters are very clear, seen from the air.

WS4 : Original photo without the saturation which also caused an oversharpening, I am afraid. I am posting this on Keith's asking. (kbr61263). Thank you Keith for your useful critique.
WS3 : Coati
WS2 : Crater " Diego de la Haya" on the right of the "green lake crater" on the map.
WS1 : A lava flow, on the left of the "green crater lake" on the map.

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Additional Photos by MarieLouise Davies (maloutim) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2267 W: 353 N: 4068] (13617)
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