1. Lines on a map or chart connecting points of equal water depth.
Usage: plural of isobath; used in oceanography, hydrography, and nautical charting

Examples

• The nautical chart displayed isobaths to help sailors navigate safely through shallow waters.
• Oceanographers use isobaths to map the underwater topography of the continental shelf.
• The isobaths on this bathymetric map show a steep drop-off near the trench.
• By studying isobaths, researchers can identify underwater canyons and ridges.
• The spacing between isobaths indicates how quickly the seafloor depth changes.