A topographic line on a map connecting points of equal height or elevation (also called a contour line).
From 'contour' (from French 'contour,' meaning outline) plus 'line.' It's a technical term used in cartography and geography.
Hikers use contline maps to plan routes—closely spaced contlines mean steep hills, while far-apart lines signal gentle slopes; reading contlines is like learning to see the landscape's hidden 3D shape on flat paper.
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