Strategic importance of kurgans shown in a portion of a topographic map, with the position of earthly mound called "Marinka" (at 96 metres altitude point). Used solely for educational purposes, to illustrate a historic landscape feature, without unobvious or unpublic detail - such as place names, boundaries and cartographic elements. (Although the map itself was not in public domain, it had no proper copyright notice and is old enough not to be considered offence of copyright.)