Two Red-eyed Tree frogs (Agalychnis callidryas) mate at “Exotic Fauna” breeding zoo, where exotic animals are reproduced to be marketed as pets in U.S., Canada and Asia, in Ticuantepe, on the outskirts of Managua, Nicaragua on July 17, 2022. (Photo by Maynor Valenzuela/Reuters)

A model presents creations by Indian designers Paras and Shalini during the Fashion Design Council of India (FDCI) Lakme Fashion Week (LFW) in Mumbai, India, 15 March 2024. The FDCI x Lakme Fashion Week runs from 13 to 17 March 2024. (Photo by Divyakant Solanki/EPA)

A member of the Fientan group, a contemporary dance company of young deaf and mute people from Burkina Faso, performs during the Market for Performing Arts in Abidjan (MASA), at the Culture Palace in Abidjan, Ivory Coast on April 17, 2024. (Photo by Luc Gnago/Reuters)

Paul Dixon is an engineer by day and an astrophotographer by night. He shot this broken boat on Dungeness beach, Kent in the last decade of August 2024, 17 times, stacking the images upon each other before combining them with a similar composite of the Milky Way. (Photo by Paul Dixon/Media Drum Images)

Belgian Fran Vanhoutte celebrates as she crosses the finish line at the finals of the women's 500m +D speed skating event, at the World Games 2025, in Chenghdu, China, on Thursday 14 August 2025. This year, the World Games take place from 7 to 17 August. (Photo by Rex Features/Shutterstock)

Kenya's Reynold Cheruiyot (centre L) and Britain's athlete Jake Wightman fall after crossing the finish line in the men's 1500m final during the World Athletics Championships in Tokyo on September 17, 2025. (Photo by Jewel Samad/AFP Photo)

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.

ESA astronaut Paolo Nespoli looks on after landing back on Earth from their Soyuz TMA-20 spacecraft on May 24, 2011 in Zhezkazgan, Kazakhstan. The mission of the Soyuz TMA-20 was launched last December to the International Space Station with the flight engineers Catherine Coleman from the United States, Russian cosmonaut Dmitry Kondratyev and Italian astronaut Paolo Nespoli. The next expedition is expected to launch this June. (Photo by Stephane Corvaja/ESA via Getty Images)