What do we call a line on a map that connects points of equal elevation?

A line on a map that connects points of equal elevation is referred to as a contour line. Contour lines are essential in topographic maps, as they help visualize the terrain by indicating how steep or gentle the slope of the land is. When contour lines are close together, the slope is steep; when they are farther apart, the slope is gentler. This representation allows for a better understanding of the landscape, aiding in navigation and land use planning.

In contrast, latitude lines are used to indicate how far north or south a location is from the equator, while longitude lines indicate how far east or west a location is from the Prime Meridian. Both latitude and longitude lines are part of the geographic coordinate system used for mapping and navigation, but they do not relate to elevation. Gradient lines, while they may suggest change in a particular context, do not specifically chart elevation like contour lines do.