Which UNESCO-listed natural rock formation, stretching for about 80 kilometres along the banks of a major eastern river, consists of towering limestone pillars?

• A Krasnoyarsk Pillars
• B Manpupuner
• C Sikhote-Alin
• D Lena Pillars ✓

The Lena Pillars are Cambrian-era limestone columns rising up to 200 metres above the Lena River in Yakutia, formed by freeze-thaw weathering over hundreds of thousands of years.