World Lake Day is observed worldwide every August 27, established by the UN General Assembly in December 2024 to celebrate the importance of lakes and promote sustainable lake management and protection. This day highlights the vital role lakes play as sources of freshwater, habitats for diverse species, and contributors to climate regulation. Lakes, which cover nearly 4% of the Earth's land surface, are facing threats from pollution, climate change, and overuse, making it crucial to address these challenges. The observance aims to educate the public about the ecosystem value of lakes and the need for coordinated action to conserve and restore them. Notable lakes include the Caspian Sea, the largest by surface area, and Lake Baikal, the deepest and oldest freshwater lake.