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.

Spanish journalist and writer Noemi Casquet attends the 26th Malaga Film Festival closing ceremony at the Cervantes Theater on March 18, 2023 in Malaga, Spain. (Photo by Carlos Alvarez/Getty Images)

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Spanish flamenco dancer Salome Ramirez performs in the show “Authentic Flamenco”, the show of the Teatro Real in Madrid, at the Sao Pedro theater in Sao Paulo, Brazil, 14 December 2022. After a successful tour in the United States and India, the show has arrived in the country of samba and carnivals, this time by the dancer Eduardo Guerrero and his work “Faro”. (Photo by Isaac Fontana/EPA/EFE/Rex Features/Shutterstock)

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Relatives mourn over the shrouded body of Mohammad Abed, who is killed in an Israeli airstrike on a shelter in Gaza City, during his funeral in Gaza City, on April 19, 2025. (Photo by Majdi Fathi/NurPhoto/Rex Features/Shutterstock)

Honor guards are viewed during an official welcoming ceremony for Turkish President Recep Tayyip Erdogan by Albanian President Bajram Begaj, in Tirana, Albania on October 10, 2024. Turkish President Recep Tayyip Erdogan was welcomed by Albanian President Bajram Begaj with an official ceremony ahead of their meeting. (Photo by Mehmet Ali Ozcan/Anadolu via Getty Images)