Natural lakes are large bodies of freshwater or saltwater that have formed through various geological processes, such as glacial activity, tectonic movements, or volcanic eruptions. They play a crucial role in the ecosystem, providing habitats for diverse wildlife and serving as important resources for human activities like fishing and recreation. These lakes can vary greatly in size, depth, and ecological characteristics. Some well-known examples include Lake Superior, Lake Baikal, and Lake Victoria. Natural lakes also contribute to the hydrological cycle, influencing local climates and water availability in surrounding areas.