Написать коротко на английском языке сообщение об озере Байкал.

Lake Baikal is the deepest and oldest freshwater lake in the world, located in Siberia, Russia. It reaches a depth of about 1,642 meters (5,387 feet) and is estimated to be around 25 million years old. Baikal is known for its incredible biodiversity, hosting many unique species, including the Baikal seal. The lake is also famous for its stunning natural beauty, surrounded by mountains and forests, making it a popular destination for tourists and researchers. Additionally, it holds approximately 20% of the world's unfrozen freshwater, making it a vital resource for the region.