Contour lines are curved, straight or a mixture of both lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes.
Iyaka tan win taɣelit akrambayan , oɣad meɣ tartit n iyaka tan fuk fal karti tassuknat ammas n arori n tiditt ilan iyyan meɣ abyon tan ajjotnen ozɣaɣnen.