There are a lot of amazing natural wonders of Kamchatka.
Volcano Malii Semyachik
Named by a vulcanologist Troitskii in 1946.
diameter ~700 meters; oval shape; light-green colour ; wall height less than 200 meters
Formed only years ago.
acid solution; dangerous for the health; 300˚С; floating sulfur pieces in the water
corroded by acid