The Altar is an extinct volcano on the Western side of Sangay National Park in Ecuador, 170 km south of Quito. Altar was active about 2 million years ago and containsa boiler open towards the West, containing a Lake of laguna yellow name. 

http://www.cotopaxi-travel.com/ecuador-trekking-altar-volcano.php
The Altar is an extinct volcano on the Western side of Sangay National Park in Ecuador, 170 km south of Quito. Altar was active about 2 million years ago and containsa boiler open towards the West, containing a Lake of laguna yellow name. 

http://www.cotopaxi-travel.com/ecuador-trekking-altar-volcano.php