Top 10 Most Impressive Geological Formations

Yellowstone's largest hot spring spans 90 metres across and radiates rings of vivid orange, yellow, and green created by heat-loving bacteria, sitting atop one of the world's most active volcanic systems.

Millions of years of red sandstone and mineral deposits created these surreal rainbow mountains in Gansu province, with stripes of crimson, amber, and jade that look digitally enhanced but are entirely natural.

Volcanic eruptions deposited soft tuff across central Anatolia millions of years ago, and differential erosion carved thousands of pointed pillars, some capped with harder basalt that protected the softer stone beneath.

Flash floods carved this narrow slot canyon near Page, Arizona into sinuous sandstone waves that glow in shades of orange and violet when shafts of midday sunlight penetrate to the canyon floor.

The world's largest salt flat spans 10,582 square kilometres of blinding white at 3,656 metres elevation, containing an estimated 50 to 70 percent of the world's lithium reserves beneath its crust.

A vast labyrinth of razor-sharp limestone needles up to 70 metres tall, eroded by tropical rain over millions of years, shelters unique lemur species and endemic plants in its inaccessible crevices.

Thirty million years of limestone dissolution created an underground wonderland of stalactites, stalagmites, and subterranean rivers, with glowworm-lit chambers that rank among the planet's most extraordinary cave systems.

Calcium-rich thermal springs cascading down a hillside in Denizli province have deposited brilliant white travertine terraces over thousands of years, creating natural infinity pools that have attracted visitors since Roman times.

This 15-metre-high granite cliff face near Hyden in Western Australia curves like a breaking ocean wave, formed over 2.7 billion years through chemical weathering and water runoff that stained it in bands of grey, ochre, and red.

Yellowstone's largest hot spring spans 90 metres across and radiates rings of vivid orange, yellow, and green created by heat-loving bacteria, sitting atop one of the world's most active volcanic systems.

Millions of years of red sandstone and mineral deposits created these surreal rainbow mountains in Gansu province, with stripes of crimson, amber, and jade that look digitally enhanced but are entirely natural.

Volcanic eruptions deposited soft tuff across central Anatolia millions of years ago, and differential erosion carved thousands of pointed pillars, some capped with harder basalt that protected the softer stone beneath.

Flash floods carved this narrow slot canyon near Page, Arizona into sinuous sandstone waves that glow in shades of orange and violet when shafts of midday sunlight penetrate to the canyon floor.

The world's largest salt flat spans 10,582 square kilometres of blinding white at 3,656 metres elevation, containing an estimated 50 to 70 percent of the world's lithium reserves beneath its crust.

A vast labyrinth of razor-sharp limestone needles up to 70 metres tall, eroded by tropical rain over millions of years, shelters unique lemur species and endemic plants in its inaccessible crevices.

Thirty million years of limestone dissolution created an underground wonderland of stalactites, stalagmites, and subterranean rivers, with glowworm-lit chambers that rank among the planet's most extraordinary cave systems.

Calcium-rich thermal springs cascading down a hillside in Denizli province have deposited brilliant white travertine terraces over thousands of years, creating natural infinity pools that have attracted visitors since Roman times.

This 15-metre-high granite cliff face near Hyden in Western Australia curves like a breaking ocean wave, formed over 2.7 billion years through chemical weathering and water runoff that stained it in bands of grey, ochre, and red.