 There is an exclave of Bremen in Bremerhaven, the "Citybremian Overseas Port Area Bremerhaven" ("Stadtbremisches Überseehafengebiet Bremerhaven").Bremen is the fourth largest city in the Low German dialect area after Hamburg, Dortmund and Essen.Bremen's port, together with the port of Bremerhaven at the mouth of the Weser, is the second largest port in Germany after the Port of Hamburg.