I believe you are referring to a 'chart'.
Marine Chart or Nautical Chart.
To locate coastlines on a map, look for the boundary where land meets water. This is typically indicated by a distinct line or contour on the map, often marked with blue for oceans, seas, or lakes. Topographic maps may show additional details like elevation changes near the coast. Satellite imagery can also provide a clear view of coastlines, highlighting their shape and features.
topography map
political map.
a topographic map
A topographic map :D
physical map
a political map
Meteorological.
i dk
a political map