On a map, what does the symbol of a blue line usually represent?

rivers streams small lakes canals or lake borders aka water ways

On a map, the symbol of a blue line usually represents water features such as rivers, streams, small lakes, canals, or lake borders. If you come across a blue line on a map, it provides a visual representation of these waterways. This helps in understanding the geography and topography of an area, as well as identifying potential obstacles or points of interest related to water.