Bahahaha. They are called contour lines! That's the scientific name.
Contour lines that touch or overlap on a topographic map indicate a
The heaviest contour lines on a topographic map indicate the highest elevation on the map. These lines represent the peaks of mountains, hills, or other elevated land features.
Contour lines show elevation.
Contour lines that touch or overlap on a topographic map indicate a
A map with contour lines is called a topographic map. These lines represent changes in elevation and help to visualize the shape of the terrain. Topographic maps are commonly used for hiking, surveying, and land navigation.
Contour lines show levels of elevation, where there are hills and valleys on a map
The closer the contour lines, the steeper is the slope.
Contour lines show elevation.
Closely spaced contour line on a topographic map shows that the land is steep.
A contour chart is a map that shows contour lines. A good example of this is a topographic map.
Contour lines
Hachured contour lines are contour lines with ticks pointing downslope that indicate a depression on a topographic map.