Which map illustrates the depths of a body of water?

A bathymetric map is specifically designed to represent the underwater depths of bodies of water, such as oceans, seas, lakes, and rivers. This type of map utilizes contour lines or color gradients to indicate varying depths, allowing navigators, scientists, and researchers to understand the topography of the underwater landscape. Bathymetric mapping is crucial for various applications, including nautical navigation, marine biology studies, and environmental assessments.

In contrast, a planimetric map focuses on two-dimensional representations of geographical features without incorporating elevation or depth data. An isohyetal map represents rainfall distribution across an area, showing how much precipitation varies. A vector map uses points, lines, and polygons to represent spatial data but does not specifically depict underwater depths. Thus, the bathymetric map is the appropriate choice for illustrating water depths.