What is the purpose of a legend on a map?

The purpose of a legend on a map is to explain the markings and symbols used throughout the map. This is essential because maps often contain various symbols representing different features, such as roads, bodies of water, campgrounds, or topographical features. Without a legend, a map could be confusing and difficult to interpret, as individuals may not understand what each symbol represents. The legend acts as a key, providing clarity and ensuring that users can accurately read and navigate the map's content. Understanding the legend is crucial for effective map reading and navigation, as it allows individuals to identify locations and features accurately.

The other options, while related to maps, serve different purposes. The scale indicates distances, elevation markings inform about topographic changes, and a historical background provides context for the region but does not aid in interpreting the map's symbols.