Shading Line on a Map Used to Denote Steep Slopes

This page is the CodyCross answer for the clue below from Concert Hall, Group 600, Puzzle 5 (Philharmonie De Paris).

Question is: Shading Line on a Map Used to Denote Steep Slopes

and the answer is: HACHURE

Word Meaning:

HACHURE — (cartography, chiefly historical) A line on a map indicating the steepness of a slope.

Definitions from Wiktionary.