Landscape and water
Relief and contour lines
Contour lines join points at the same height. They let you read on a flat map how high a hill is and where it gets steep.
What you need first
Why
Cycling in the Flemish Ardennes or walking in the Ardennes: how do you know beforehand which climb will be hard?
A map is flat, the land is not. Still, you want to know where the road goes uphill, how high a summit is and where you had better not race down on your bike.
That is why mapmakers draw contour lines. If you can read them, you see a hill, a valley or a steep wall on a flat sheet.
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