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            | EAST GERMANY BORDER FORTIFICATION SYSTEM |  
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            | Key |  
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                Actual border line
                Border marker or boundary stone
                Border column
                Outer strip (East German territory)
                Outer anti-vehicle ditch (dug-up road)
                Expanded-metal mesh fence (single layer)
                Access gate
                Double fence (for high security areas) with minefield       in between fences
                Concrete-faced anti-vehicle ditch
                Control strip
                Guard patrol road
                Floodlights
                BT-11 observation tower
                Observation bunker
                Führungstelle command tower
                BT-9 observation tower
                Dog run
                Signal fence floodlights
                Concrete wall adjoining built-up area
                Signal fence
                Signal fence gate
                Entry gate to the security zone |  |