Related to the measurement of ocean or other water depths is called what?

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Bathymetry is the practice of measuring how deep bodies of water are and charting the underwater terrain. The term itself comes from bathy- meaning deep and -metry meaning measurement, so it precisely describes depth measurement of oceans, seas, and lakes as well as the maps that result from those measurements. This focus on depth and the shape of the seafloor is what makes it the best fit for the question. Other terms are broader or pertain to different aspects: hydrographic work can include water-levels, currents, and shoreline data, oceanographic studies cover the physical and chemical properties of the ocean, and nautical relates to navigation rather than depth measurement. Bathymetric data underpin nautical charts and reveal features like trenches, shelves, and underwater mountains.