Nabiyotum Crater, Kenya
Nabiyotum Crater is located in the south of Lake Turkana in Kenya – the world’s largest alkaline lake.

Photo: Martin Harvey

Kelimutu, Indonesia
The volcano contains three striking summit crater lakes of varying colors. The lake colors vary on a periodic basis. Sub aqueous fumaroles are the probable cause of active upwelling that occurs at the two eastern lakes. The visitor is never quite sure what color the lakes will be when they reach the top.

photo: Ignaz W. Mudja

Satellite view (Google Maps / May 29, 2012)

Diamond Head, Hawaii, USA
Diamond Head is the name of a volcanic tuff cone on the Hawaiian island of Oʻahu and known to Hawaiians as Lēʻahi, most likely from lae ‘browridge, promontory’ plus ʻahi ‘tuna’ because the shape of the ridgeline resembles the shape of a tuna’s dorsal fin. Its English name was given by British sailors in the 19th century, who mistook calcite crystals embedded in the rock for diamonds.

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Crater in Rocas Bainbridge,Galapagos Islands,Ecuador

Turquoise lake nestled in the crater of this extinct volcano is a shallow saltwater lake. It is a meeting place for a large number of flamingos, who come here to feed.

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Xico, Mexico
Xico volcano sits at the extreme southern end of the Mexico City. For a geologically significant chunk of time, this area was underwater, drowned by Lake Chalco. The lake began to dry out in the 1300s, and Aztec fishermen settled along its coastline hereabouts. In the nineteenth century, the government drained the lake entirely.

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Molokini, Hawaii, USA
Molokini is a crescent-shaped, partially submerged volcanic crater which forms a small islet located in Alalakeiki Channel. It is a popular tourist destination for scuba diving, snuba and snorkeling.

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Seongsan Ilchulbong, South Korea
Seongsan Ilchulbong situated on the eastern seaboard of Jeju Island and said to resemble a gigantic ancient castle, this tuff cone is 182 meters (600 ft) high, has a preserved bowl-like crater and also displays diverse inner structures resulting from the sea cliff.

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Santa Margarida Volcano, Spain
The Santa Margarida Volcano is a volcano in the comarca of Garrotxa, Catalonia, Spain. The volcano has a perimeter of 2 kilometers and a height of 682 meters and is part of the Garrotxa Volcanic Zone Natural Park.

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Koko Crater, Hawaii, USA
Koko Head has three significant depressions or old vents, the largest of which forms the well-known Hanauma Bay.

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Aogashima, Japan
Aogashima is a volcanic Japanese island in the Philippine Sea. The biggest attraction is Aogashima’s double volcano. The island itself is a giant volcanic crater, and within that crater there’s another, smaller volcano.

Volcanic island of Aogashima