Cave lakes are bodies of water that form within caves, often created by the accumulation of groundwater or the flooding of underground passages. These lakes can vary in size and depth, and their water is typically clear due to the lack of sediment disturbance. The unique environment of cave lakes can support specialized ecosystems, including unique species of fish and invertebrates. The formation of cave lakes is often associated with geological processes such as karst topography, where soluble rocks like limestone dissolve over time, creating underground voids. Many cave lakes are found in famous cave systems, such as the Carlsbad Caverns in the United States or the Postojna Cave in Slovenia, attracting visitors and researchers alike.