Domi, 29, and Thomas, 34, a couple from Slovakia, overlooking the lake at the Ijen crater in Java, Indonesia. The couple hiked by night to the top of the volcano crater.

K awah Ijen is a giant, active volcano on the island of Java with a crater that contains the world's largest acidic lake. The water has a pH lower than 0.3 in parts of the lake where hydrothermal ...

Mount Ijen crater lake. CNN. The crater lake is a milky blue, with fumes billowing across its surface. The water in the lake is warm to the touch and 200 meters deep.

Kawah Ijen Crater Lake is the world’s largest acid soup – one km wide with a maximum depth of 200 metres. Due to its high levels of hydrochloric acid – with an average pH of 0.4 it could ...

At 2,600 meters (8,530 feet), Ijen is also a working mine where men carry up to 100 kilos (220 pounds) of sulfur by hand out of the noxious crater and down the volcano's outer slopes to a weigh ...

With its wickedly steaming cyan lake, pulsing exhausts of burning sulphur and jagged peaks, Ijen Crater in East Java is entirely otherworldly. Miners endure the noxious gas of the crater to ...

The woman, identified as 31-year-old Chinese citizen Huang Lihong, was with her husband on a guided tour of Ijen -- a volcano park in East Java -- when she tumbled into the crater Saturday.

Kawah Ijen is an active volcano on the island of Java with an extremely acidic crater lake and gas emissions that produce blue flames upon contact with oxygen in Earth's atmosphere.