The deepest lake in the world is Lake Baikal, located in Siberia, Russia. It reaches a maximum depth of approximately 1,642 meters (5,387 feet) and is also the largest freshwater lake by volume. Lake Baikal is renowned for its unique biodiversity, including the Baikal seal, and is a UNESCO World Heritage site. Its formation, through tectonic activity, makes it one of the oldest and most fascinating lakes globally.