5. Les Statistiques du Mur The Wall in numbers (As of 31.07.1989, Lapp/Ritter, Die Grenze, 1997) 124,3 km Border patrol roads 127,5 km Contact or signal fences 105,5 km Anti-vehicle trenches 259 Dog runs 20 Bunkers 302 Observation towers 6 Border crossings between the GDR and West Berlin (roads/railway) 8 Border crossings between East and West Berlin (roads/railway) 112 km Border between West Berlin and the GDR (“outer ring”) 43 km Inner-city border between East and West Berlin 155 km Total length of the border to West Berlin