This volcanic crater lake is covered with duck weed, making it look like a putting green from the viewpoint far above. (gapyear.com)
The volcano's last violent activity in 1991 was the 2nd largest terrestrial eruption of the 20th century, and has created a magnificent crater lake as well as altering the entire landscape. (philippinestravelpackage.com)
And the structures that remain apparently release methane gas for some time — as is evidenced by continued high methane concentrations found at crater sites and by observed emissions from crater lake surfaces. (robertscribbler.com)