Using a uniform methodology, we explored cartographic elements on almost sixty medium-scale maps showing Slovenian territory from the sixteenth to nineteenth centuries. One of the elements examined was also borders. We were interested in how borders in different periods were displayed on maps and how they are cartographically presented. Lines and polygons were mostly used to display the borders. Polygons are usually coloured or patterned. Lines are more effective. Typically, they are of different shape, thickness, and colour. Only ten percent of the maps examined lack borders. Two-thirds of the maps highlight the borders with a colour.