Quilotoa Crater Lake – Ecuador. Quilotoa is a water-filled caldera and the most western volcano in the Ecuadorian Andes. The Lake is too beautiful volcanic lake located at 3800 m (12,400 feet) between the towns of Zumbahua and Chugchilan. Its emerald water spans two kilometers. Local legend claims it is connected to the ocean and is therefore salty and sulfuric. Quilotoa is an active volcano, the last major eruption was over 850 years ago.