The Strait of Dover or Dover Strait, historically known as the Dover Narrows (French: Pas de Calais ( p d ( ) kal ), "Strait of Calais"; Dutch: Nauw van Calais (nu vn kal) or Straat van Dover ), is the strait at the narrowest part of the English Channel, marking the boundary between the Channel and North Sea, separating Great Britain from continental Europe. The shortest distance across the strait, 33.3 kilometres (20.7 miles; 18.0 nautical miles), is from the South Foreland, northeast of Dover in the English county of Kent, to Cap Gris Nez, a cape near to Calais in the French departement of Pas-de-Calais. Between these points lies the most popular route for cross-channel swimmers. The entire strait is within the territorial waters of France and the United Kingdom, but a right of transit passage under the UNCLOS exists allowing for unrestricted shipping.

Where is the strait of dover located on a map? OK. Let's think. My stream of consciousness:
The relevant sentence in the passage is: The Strait of Dover or Dover Strait, historically known as the Dover Narrows (French: Pas de Calais ( p d ( ) kal ), "Strait of Calais"; Dutch: Nauw van Calais (nu vn kal) or Straat van Dover ), is the strait at the narrowest part of the English Channel, marking the boundary between the Channel and North Sea, separating Great Britain from continental Europe. The answer is the narrowest part of the English Channel , marking the boundary between the Channel and North Sea.