Lake Baikal is the world's oldest lake, at 25 million years (possibly older), and deepest, averaging 744.4 metres (2,442 ft).

Located in the south of the Russian region of Siberia, between Irkutsk Oblast to the northwest and the Buryat Republic to the southeast, it is the most voluminous freshwater lake in the world, containing roughly 20% of the world's unfrozen surface fresh water.

Thousands of revelers continue to enjoy themselves throughout the night on Sunrise Beach on February 25, 2005 in Haadrian, Koh Phangan. (Photo by Shaul Schwarz/Getty Images)

Spacewalker Mark Vande Hei took his own photograph during the first spacewalk of 2018, on January 23, 2018. These sky-high pictures are better known as “space-selfies”. (Photo by Mark Vande Hei/NASA)

Fishermen use traditional cone-shaped nets on Inle lake in Myanmar in February 2022. The men steer their boats with an oar that they control with their feet. They throw the net into the water and push it down so it sinks to the bottom, then drag it back to the surface with the fish trapped inside. (Photo by Alahattin Kanlioglu/Solent News)

A worker cleans the statue of Yuri Gagarin, the first person who flew to space, ahead of Cosmonautics Day celebrated on April 12, in Moscow, Russia, Wednesday April 10, 2019. Cosmonautics Day marks when Soviet cosmonaut Yuri Gagarin became the first man to fly in space, in 1961, orbiting the earth once before making a safe landing. (Photo by Maxim Marmur/AP Photo)

A man with henna-dyed hair rests on a road near the port area in Karachi, Pakistan on July 3, 2019. (Photo by Akhtar Soomro/Reuters)

Kamaz' Russia driver Andrey Karginov, co-driver Andrey Mokeev and Igor Lenonov compete during the Stage 6 of the Dakar 2020 between Ha'il and Riyadh, Saudi Arabia, on January 10, 2020. (Photo by Franck Fife/AFP Photo)