Which lake, the world's deepest, contains one-fifth of all the world's fresh water?

Deep in the heart of Siberia lies a truly remarkable natural wonder: Lake Baikal. This immense body of water holds the title of the world's deepest lake, plunging to an astonishing depth of 5,700 feet, or 1,740 meters, at its lowest point. But its depth isn't its only claim to fame; Lake Baikal also contains an incredible one-fifth of all the liquid fresh surface water on Earth, making it an invaluable global resource.

This ancient rift lake is estimated to be between 25 and 30 million years old, making it the oldest lake in the world as well. Its immense age and isolation have contributed to an extraordinary level of biodiversity. Baikal is a UNESCO World Heritage site, home to thousands of species of plants and animals, many of which are found nowhere else on Earth. Notable endemic species include the Baikal seal, the only freshwater seal in the world, and the omul fish, a staple for local communities.

The sheer volume and clarity of Baikal's water are astounding, often allowing visibility down to 130 feet. Its pristine nature and unique ecosystem make it a subject of continuous scientific study and a source of wonder. Protecting this "Sacred Sea," as it's often called by locals, is crucial for preserving a significant portion of the planet's freshwater supply and its unparalleled biological heritage.