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.

An Iraqi army cadet performs “the leap of faith” from a bridge in Baghdad, September 22, 2015. (Photo by Ahmed Saad/Reuters)

Iranian soccer fan wait for the start of the group B match between Iran and Spain at the 2018 soccer World Cup in the Kazan Arena in Kazan, Russia, Wednesday, June 20, 2018. (Photo by Diego Azubel/EPA/EFE)

A contestant prepares at the backstage before the Miss Transqueen India 2018 transgender beauty pageant in Mumbai, India on October 7, 2018. (Photo by Francis Mascarenhas/Reuters)

Hong Kong art gallery director Sarah Greene said that Wolf, known for his work depicting mega-cities, has died Tuesday, April 24, 2019 night at his home. She said he was 64. Wolf won first prize in the World Press Photo competition in 2005 and 2010. Here: Architecture of Density #119, 2009. (Photo by Michael Wolf, courtesy of Flowers Gallery)

Family Donation by Si Thu Ye Myint (Myanmar, Winner). Myin Twin village in upper Myanmar. (Photo by Si Thu Ye Myint/Sony World Photography)

Models present creations from the Emporio Armani Fall/Winter 2024/2025 collection during Fashion Week in Milan, Italy on February 22, 2024. (Photo by Alessandro Garofalo/Reuters)

A general view as runners clear a fence during The Gamble Responsibly At BetMGM Handicap Chase at Fontwell Park Racecourse on October 23, 2024 in Fontwell, England. (Photo by Alan Crowhurst/Getty Images)