Lake Baikal, located in Siberia, Russia, is the deepest lake in the world, reaching a maximum depth of 5,387 feet. It is also the oldest freshwater lake, estimated to be 25 million years old. This UNESCO World Heritage Site holds about 20% of the world's unfrozen freshwater and is home to unique species such as the Baikal seal and omul fish.

Lake Baikal is a vital ecosystem and a cultural landmark. Its clear waters and surrounding mountains make it a popular destination for tourism and scientific study. However, industrial pollution and climate change threaten its pristine environment. Efforts to preserve this natural wonder focus on sustainable practices and raising awareness about its global importance.