A cartographic representation detailing the subterranean waterways, geological formations, and key landmarks of a concealed or vanished fluvial system. This type of depiction often aims to reveal features inaccessible through surface observation, such as underwater cave systems, mineral deposits, or the course of an ancient riverbed. An example might chart the drainage patterns beneath a karst landscape, illustrating the flow from sinkholes to resurgence points.
These visualizations are valuable tools for a diverse range of applications. They facilitate hydrological research by providing insights into groundwater flow and aquifer connectivity. Explorers and adventurers utilize them for navigation and the identification of potential hazards in subterranean environments. Furthermore, these depictions possess historical significance, potentially uncovering forgotten settlements or ecological changes that influenced past human populations.