On a nautical chart, the drying height1 is the vertical distance of the seabed that is exposed by the tide, above the sea water level at the lowest astronomical tide.
On admiralty charts a drying height is distinguished from a depth by being underlined.
References
References
- Jollands, Simon (25 April 2023). "Tidal terms and definitions". safe-skipper.com. Retrieved 8 July 2025.