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Underground rivers are bodies of water that flow beneath the Earth's surface, often within caverns, caves, or porous rock formations. These hidden waterways can range in size from small streams to large, subterranean rivers, and are typically formed through the erosion of soluble rocks such as limestone or by the infiltration of surface water into the ground. Underground rivers play a crucial role in the Earth's hydrological cycle, helping to replenish groundwater supplies and support ecosystems that rely on these hidden water sources for survival.