等とう高こう線せん

noun

contour line; contour

Technical term used in geography, cartography, and related fields to refer to lines on a map connecting points of equal elevation.

• この地ち図ずの等とう高こう線せんは10メートル間かん隔かくで引ひかれている。

  The contour lines on this map are drawn at 10-meter intervals.