Correct Example [#1330]

of: 513.2 Retaining wall (ISOM 2017-2)
from: Pélussin, France

A significant wall of stone which is seen only from one side.

Retained wall in forest near Vojtíškov, Czechia. Photo by: Radim Ondráček (CC BY-SA 4.0)
Retained wall next to the vehicle track near Pélussin, France. Photo by: Luděk Krtička (CC BY-SA 4.0)