Poland's Pia Skrzyszowska (C) wins gold in the women's 100m Hurdles final during the European Athletics Championships at the Olympic Stadium in Munich, southern Germany on August 21, 2022. (Photo by Ina Fassbender/AFP Photo)

Spain's Paula Badosa gives a thumbs up after falling on the court during her women's singles semi-final match against Belarus' Aryna Sabalenka on day twelve of the Australian Open tennis tournament in Melbourne on January 23, 2025. (Photo by David Gray/AFP Photo)

A member falls as Team Kazakhstan competes during the women's team pursuit speed skating final at the 9th Asian Winter Games in Harbin, China on Tuesday, February 11, 2025. (Photo by Aaron Favila/AP Photo)

Emma Navarro of the U.S. celebrates with supporters after beating Veronika Kudermetova of Russia in their second round women's singles match at the Wimbledon Tennis Championships in London, Thursday, July 3, 2025. (Photo by Joanna Chan/AP Photo)

Yaroslava Mahuchikh, of Ukraine, competes in the women's high jump competition at the Wanda Diamond League Final 2025 athletics meeting in Zurich, Switzerland, Wednesday, August 27, 2025. (Photo by Til Buergy/Keystone via AP Photo)

Actors Molly McNearney and Jimmy Kimmel attend The Hollywood Reporter's Annual Women in Entertainment Gala at The Beverly Hills Hotel on December 03, 2025 in Beverly Hills, California. (Photo by John Salangsang/Rex Features/Shutterstock)

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.

Sports Finalist – Ian MacNicol. Michalina Kwasniewska of Poland competes in the Women's high jump during day one of The European Athletics U23 Championships 2013 on July 11, 2013 in Tampere, Finland. (Photo by Ian MacNicol/Agence France-Presse)