What type of map uses contour lines to depict bathymetry in maritime areas?

A nautical chart is designed specifically for maritime navigation and safety and utilizes contour lines to represent bathymetry, which is the study of underwater depth and features. These contour lines, often referred to as isobaths, illustrate the depths of water bodies by connecting points of equal depth. This information is vital for sailors to navigate safely, avoiding underwater hazards and determining the appropriate depths for their vessels.

In contrast, topographic maps depict land features and elevations using contour lines, but they do not focus on underwater features. Political maps serve to define boundaries of countries, states, or regions without providing physical topography or bathymetric details. Climate maps illustrate weather patterns and climatic regions, which also do not relate to underwater topography. Therefore, the nautical chart is unequivocally the correct choice for representing bathymetry maritime areas.