Where a contour line crosses a river, it makes a v shape. the open side or mouth of the v indicates
-upstream
-downstream
-tilted strata
-a fold

If a contour line crosses a river makes a v shape, the open side or mouth of the V indicates : Downstream
The downstream river contour line refer to the contour line that is drawn in a position further along a river or sea as it makes its way tot he sea

Answer meranesia;