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A contour line is simply a line drawn on a map to show land the same elevation (height above sea level). The British Ordinance Survey maps, for example, typically use brown lines to shown land at 50 metre intervals. If you walked along a contour line, you would be walking on entirely flat ground, neither rising or falling. Where the contour lines on a map are close together, it means that the land rises or falls sharply, as on the side of hills, etc.

You can see an image of contour lines on images.Google.com - search "contour lines".

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