Which lake is the oldest known freshwater lake?

Lake Baikal is widely recognized as the oldest freshwater lake in the world, with an estimated age of about 25 million years. Most lakes are geologically short-lived, but Baikal persists because it sits in an active rift zone. This age has allowed unique animals and plants to evolve within the lake, many found nowhere else. Scientists value Baikal for both its biodiversity and its long climate record preserved in sediments. It is one of the most extraordinary freshwater systems on the planet.