circles inside circles with teeth inside the last circle
Hachured contour lines on a topographic map indicate a depression or a hole in the ground. They are lines that have small perpendicular lines extending from them, pointing inward toward the depression or lower elevation area they represent.
What I need is a topographic map!
A depression on a topographic map represents a lower elevation area relative to the surrounding terrain. It is typically shown with contour lines forming closed loops pointing towards lower elevation at the center, resembling a bowl or crater shape.
The small loop on a topographic map typically represents a closed depression or sinkhole. The dot indicates the highest point within a closed contour on the map.
a topographic map
I believe it is a Thematic map.
A pit on a topographic map represents a depression or low area in the landscape, typically surrounded by higher elevation contours. Pits can be natural features, such as sinkholes or craters, or man-made features like quarries or mines. They are represented by concentric contour lines that indicate the depth and shape of the depression.
A topographical map.
A depression is shown by contour lines with small marks pointing toward the lowest point of the depression.
Topographic map
There will be a continuous line describing the perimeter of the depression, and along this line will be short spikes extending inwards; indicating that there may be a cliff there. Ordinarily, they will be marked in black, but on a glacier, they will be shown in blue. This convention should be indicated on the legend of the map.
Hachured contour lines are contour lines with ticks pointing downslope that indicate a depression on a topographic map.