Answer:
contour lines
Step-by-step explanation:
Contour lines is a map feature which help to indicate region of equal height in a map.
In a map, contour lines are usually drawn in irregular circles repeatedly, until the elevations of the region are fully represented.
The inner part of the contour lines usually denote high elevation while the outter contour lines usually denote lower elevation.
Therefore the map feature that best indicates whether two regions have the same elevation is contour lines.