2. The Acid Lakes of Dallol Volcano, Ethiopia

The Afar people coined the term Dallol, describing the dissolution of a landscape consisting mostly of acid ponds that snooze in the hot sun. Yellow and orange hues of sulfur and iron oxide dominate this extraordinary lake and rocky shore. Dallol Volcano was formed during an eruption in 1926, adding this fascinating maar or explosion crater to the Erta Ale Range in Ethiopia. Surrounded by salt flats, the lake lies in the hottest inhabited place on Earth.