1. Plural of hydrography; detailed descriptions or maps of bodies of water, including their physical features, depths, and currents.
Usage: technical; nautical
2. The scientific study and surveying of oceans, seas, rivers, and other water bodies.
Usage: technical; scientific

Examples

• The naval academy teaches students to read hydrographies of coastal regions.
• Modern hydrographies use satellite technology to map ocean depths accurately.
• Historical hydrographies helped early explorers navigate unknown waters.
• The government published updated hydrographies of the Great Lakes.
• Hydrographies are essential tools for shipping and maritime safety.