The largest freshwater lake in the world is Lake Baikal, located in Siberia, Russia. This UNESCO World Heritage site holds about 20% of the world's unfrozen freshwater, making it an invaluable ecological resource. Formed approximately 25 million years ago, Lake Baikal is also the deepest lake in the world, reaching depths of over 1,600 meters (5,250 feet). Its unique ecosystem supports a diverse range of plant and animal life, with many species found nowhere else on Earth, including the Baikal seal. The lake is a popular destination for tourists due to its stunning natural beauty and cultural significance.