Often simply referred to as a long, narrow inland lake, Lake Baikal lies in eastern Russia. But the significance of the lake is far from what it may seem at first glance. According to the United States Geological Survey (USGS), Lake Baikal is not only the deepest lake in the world but also the largest and oldest freshwater lake on Earth, storing some 23,000 cubic kilometres of water. If drained, according to USGS, it would take more water from all five of North America’s Great Lakes combined to refill it.It can be seen that the magnitude of Lake Baikal qualifies it as an extraordinary natural reservoir and has been a subject of study by many geographers and scientists alike.The sheer scale of Lake BaikalAs per NASA's Earth Observatory, Lake Baikal extends to a distance of 636 kilometres in length and to an average depth of close to a mile (1,642 meters). In terms of freshwater lakes, Lake Baikal represents an anomaly due to the amount of water it contains. Other freshwater lakes appear much larger on maps than in reality. Its depth allows this lake to hold a huge amount of water within its relatively smaller body of water compared to others.The USGS identifies Lake Baikal as one of the greatest water reservoirs on earth. The significance behind this is that the lake's great depth provides a relatively stable body of water in the long run.Depth and its scientific significanceDepth in lakes is more than a measurement of vertical distance; it fundamentally influences how water behaves and persists. Reportedly, Lake Baikal is both a body of freshwater and an archivist. This is possible because of its great depth and stability, making it a perfect place to conduct research on water storage and environmental conditions.As explained, the large volume of water in the lake is not distributed over a vast area but rather is contained in a small, highly efficient basin. The oldest freshwater giantMoreover, Baikal is the oldest body of freshwater on Earth. As reported, Baikal's age has enabled it to endure many climate and environmental changes over time; it holds significant geological history. Its ecosystem has evolved through millions of years, making it an archive of biological and geological data.As pointed out by USGS, the age, size, and depth make Baikal unique. This is the reason why researchers always resort to Baikal while studying freshwater resources of the planet.A hidden giant visible from spaceThe surface of Lake Baikal may not look significant on the maps and satellites; however, this lake should be analysed from the perspectives of its depth and volume of water to recognise the significance of this natural formation. While the lake's length of 636 kilometres can be considered its main characteristic, it is the basin lying beneath the surface of the lake that makes the lake important. In other words, the structure of Lake Baikal, which is deep and long, contains huge amounts of water in its body.Research provides another example that can help understand the volume of water contained in Lake Baikal. It compares the total volume of the Great Lakes with the volume of water in Lake Baikal; however, even if combined, the Great Lakes will not contain as much water as Lake Baikal.Why Lake Baikal matters globallyThe importance of Lake Baikal does not only lie within Russia. Due to its tremendous water storage ability, which enables the lake to store almost one-fifth of the surface freshwater found on earth, it becomes an important natural asset. According to NASA and USGS, the Baikal is more than just a picturesque site; it is a global benchmark for water management.Considering the increasing worries about freshwater shortages around the globe, the presence of Lake Baikal provides lessons regarding natural asset concentration on Earth.