A neatline is a term used to describe the line that separates the body of a map or other document from the border. There are several synonyms that can be used to describe this line, including outline, border, perimeter, boundary, demarcation line, or edge. In cartography, the neatline can also be referred to as the frame or the map border. Regardless of the term used, the neatline serves as a visual guide and helps to define the boundaries of the map or document, making it easier to read and understand. It's a crucial element in creating a visually pleasing and informative final product.