The lake known as the deepest lake in the world is Lake Baikal in Siberia, Russia. It reaches a maximum depth of about 1,642 meters (5,387 feet) and is also recognized as the oldest freshwater lake, estimated to be around 25 million years old. Lake Baikal is a UNESCO World Heritage Site and is renowned for its unique biodiversity, including many endemic species, and its pristine waters, which contain roughly 20% of the world's unfrozen freshwater.