Huge mul­ti-kilo­­me­ter cliffs on the banks of the Lena Riv­er are a sym­bol and the main tourist high­light of the repub­lic, one of the most impres­sive sights of the coun­try. The rocks are com­posed of Cam­bri­an lime­stones, their for­ma­tion began about 400,000 years ago.