Flensburg Firth or Flensborg Fjord (German: Flensburger Förde; Danish: Flensborg Fjord) is the westernmost inlet of the Baltic Sea.
It forms part of the border between Germany to the south and Denmark to the north, on the eastern side of Schleswig Holstein and Jutland, respectively.
West of them, near the Danish coast, there are two small islands called Okseøerne (meaning Ox Isles).
Towards the west, continuing on the Danish side, are Broager, Egernsund, Gråsten, Rinkenæs, Sønderhav, and Kollund.
In Germany at the Danish border, there is Harrislee, at the inner end of the inlet the town of Flensburg, east of it on the southern shore the town of Glücksburg and the villages of Munkbrarup, Langballig, Westerholz, Quern, Steinbergkirche, Niesgrau, Gelting, and Nieby.