Trou de Bone

Impressive, 40 m deep sinkhole with a lake at its bottom. The roots of banyan trees are hanging down the cliff and reach the water.

Fontaine-de-Vaucluse (Vaucluse Spring)

Fontaine de Vaucluse, very high water level

Very powerful spring at the foot of 230 m high cliff. Average discharge – 22,000 l/s, at snow melts – 110,000 l/s – thus it is one of the most powerful springs in the world. Dived up to 308 m depth. Source of Sorgue river.

Monturaqui Crater

Monturaqui Crater, Chile

One of the most impressive impact craters in South America, created by a meteorite some 660,000 years ago. 350 – 370 m wide, up to 34 m deep.

Impact craters

Pingualuit crater, Canada

Wondermondo 🢖 Categories of wonders 🢖 Geological wonders 🢖 Impact craters Category Impact craters Described impact craters What is included in this category? Category includes outstanding impact craters – detectable scars on the surface of Earth left by a body coming from outer space. Category includes also meteorites – natural objects from the outer space. Bombardment from the space There are […]

Khoun Xe Cave (Xe Ban Fai Cave)

Inhabitant of Khoun Xe Cave - Heteropoda maxima, the largest spider in the world

Giant and unique cave, 13.6 km long. Upstream entrance is a giant sinkhole. The cave contains the largest known rimstone pools (gour pools) in the world – up to 60 m wide. Xe Bang Fai river flows through the cave for a 7 km long stretch and is one of the most powerful cave rivers in the world. Width of this underground river – 56 – 100 m. The ceiling of the cave is up to 120 m high, width is up to 200 m. The cave contains the largest known cave pearls in the world – 32 cm in diameter and even larger weird formations called Alien Eggs. Stalagmites over 20 m tall. More than 130 species of fish live in caves, some several meters long. Giant, very fast cave spiders including the giant huntsman spider.

Sautadet Falls

Sautadet Falls, France

Waterfall and rapids on Cèze river. A complex group of waterfalls and rapids that have formed on limestone. Interesting features are up to 10 m deep kettles that have been hollowed by turning stones.

Gunnuhver geothermal area

Gunnuhver geothermal area, collapsed visitors platform seen through the fume of fumarole

A geothermal field with mud pools and fumaroles, former geysers. A legend about a ghost that was dragged in the fumarole.

Pierre Saint-Martin Cave

Powerful spotlights try to illuminate the Salle de la Verna, France

Part of the cave is located also in Spain. A very long cave system, length of explored passages – 86,620 m. Up to 1,408 m deep (19th in the world). 7 entrances on the French side, 4 – on the Spanish side. One of the entrances starts with a very impressive 320 m deep abyss. Contains enormous underground voids including Salle de la Verna (the 22nd largest in the world) and Salle de l’Eclipse (the 19th largest in the world). In the Wind tunnel, there is constant wind with a speed of 11 m/s.

Wakulla Cave System

Big Dismal sinkhole, Florida

The longest mapped underwater cave system in the United States where one entrance is at Wakulla Springs. The total length of the explored passages is 72,171 m.