How wide is the location of the Battle of the Sound at its narrowest point?
Øresund: Øresund or Öresund (Danish: "Øresund" , ] ; Swedish: "Öresund" , ] ), commonly known in English as the Sound, is a strait which forms the Danish–Swedish border, separating Sjælland (Denmark) from Skåne (Sweden). Øresund:  It is 4 km wide at its narrowest point between Helsingør in Denmark and Helsingborg in Sweden.
i don't know