Lava lake of Masaya Volcano. / Jorge Mejía peralta, Flickr / CC BY 2.0
Very active and unusual volcano (635 m) with several active craters. One crater contains molten lava, Santiago crater emits large amounts of sulfur dioxide, which created acid rain and eliminated vegetation around the volcano. Masaya crater contains intermittent lava lakes – in 1670 in Nindiri crater it was up to 1 km large, by far the largest known lava lake.
Masaya volcano is included in the following article:
Lava lakes of the world in 2019 / Wondermondo / public domain
In October 2019 we have seven existing lava lakes on Earth. Three more existed for a longer time in the recent past. Besides this, since the year 2000 short-lived lava lakes and lava ponds existed in 11 more places. Wondermondo has listed them all in this article.
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 with one of the few world's lava lakes in one crater. Emits sulfur dioxide, frequent acid rains.){kind=link}